/*!
 * Vue.js v2.6.11
 * (c) 2014-2019 Evan You
 * Released under the MIT License.
 */
(function (global, factory) {
                    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
                    typeof define === 'function' && define.amd ? define(factory) :
                    (global = global || self, global.Vue = factory());
                  }(this, function () { 'use strict';
                  
                    /*  */
                  
                    var emptyObject = Object.freeze({});
                  
                    // These helpers produce better VM code in JS engines due to their
                    // explicitness and function inlining.
                    function isUndef (v) {
                      return v === undefined || v === null
                    }
                  
                    function isDef (v) {
                      return v !== undefined && v !== null
                    }
                  
                    function isTrue (v) {
                      return v === true
                    }
                  
                    function isFalse (v) {
                      return v === false
                    }
                  
                    /**
                     * Check if value is primitive.
                     */
                    function isPrimitive (value) {
                      return (
                        typeof value === 'string' ||
                        typeof value === 'number' ||
                        // $flow-disable-line
                        typeof value === 'symbol' ||
                        typeof value === 'boolean'
                      )
                    }
                  
                    /**
                     * Quick object check - this is primarily used to tell
                     * Objects from primitive values when we know the value
                     * is a JSON-compliant type.
                     */
                    function isObject (obj) {
                      return obj !== null && typeof obj === 'object'
                    }
                  
                    /**
                     * Get the raw type string of a value, e.g., [object Object].
                     */
                    var _toString = Object.prototype.toString;
                  
                    function toRawType (value) {
                      return _toString.call(value).slice(8, -1)
                    }
                  
                    /**
                     * Strict object type check. Only returns true
                     * for plain JavaScript objects.
                     */
                    function isPlainObject (obj) {
                      return _toString.call(obj) === '[object Object]'
                    }
                  
                    function isRegExp (v) {
                      return _toString.call(v) === '[object RegExp]'
                    }
                  
                    /**
                     * Check if val is a valid array index.
                     */
                    function isValidArrayIndex (val) {
                      var n = parseFloat(String(val));
                      return n >= 0 && Math.floor(n) === n && isFinite(val)
                    }
                  
                    function isPromise (val) {
                      return (
                        isDef(val) &&
                        typeof val.then === 'function' &&
                        typeof val.catch === 'function'
                      )
                    }
                  
                    /**
                     * Convert a value to a string that is actually rendered.
                     */
                    function toString (val) {
                      return val == null
                        ? ''
                        : Array.isArray(val) || (isPlainObject(val) && val.toString === _toString)
                          ? JSON.stringify(val, null, 2)
                          : String(val)
                    }
                  
                    /**
                     * Convert an input value to a number for persistence.
                     * If the conversion fails, return original string.
                     */
                    function toNumber (val) {
                      var n = parseFloat(val);
                      return isNaN(n) ? val : n
                    }
                  
                    /**
                     * Make a map and return a function for checking if a key
                     * is in that map.
                     */
                    function makeMap (
                      str,
                      expectsLowerCase
                    ) {
                      var map = Object.create(null);
                      var list = str.split(',');
                      for (var i = 0; i < list.length; i++) {
                        map[list[i]] = true;
                      }
                      return expectsLowerCase
                        ? function (val) { return map[val.toLowerCase()]; }
                        : function (val) { return map[val]; }
                    }
                  
                    /**
                     * Check if a tag is a built-in tag.
                     */
                    var isBuiltInTag = makeMap('slot,component', true);
                  
                    /**
                     * Check if an attribute is a reserved attribute.
                     */
                    var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');
                  
                    /**
                     * Remove an item from an array.
                     */
                    function remove (arr, item) {
                      if (arr.length) {
                        var index = arr.indexOf(item);
                        if (index > -1) {
                          return arr.splice(index, 1)
                        }
                      }
                    }
                  
                    /**
                     * Check whether an object has the property.
                     */
                    var hasOwnProperty = Object.prototype.hasOwnProperty;
                    function hasOwn (obj, key) {
                      return hasOwnProperty.call(obj, key)
                    }
                  
                    /**
                     * Create a cached version of a pure function.
                     */
                    function cached (fn) {
                      var cache = Object.create(null);
                      return (function cachedFn (str) {
                        var hit = cache[str];
                        return hit || (cache[str] = fn(str))
                      })
                    }
                  
                    /**
                     * Camelize a hyphen-delimited string.
                     */
                    var camelizeRE = /-(\w)/g;
                    var camelize = cached(function (str) {
                      return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
                    });
                  
                    /**
                     * Capitalize a string.
                     */
                    var capitalize = cached(function (str) {
                      return str.charAt(0).toUpperCase() + str.slice(1)
                    });
                  
                    /**
                     * Hyphenate a camelCase string.
                     */
                    var hyphenateRE = /\B([A-Z])/g;
                    var hyphenate = cached(function (str) {
                      return str.replace(hyphenateRE, '-$1').toLowerCase()
                    });
                  
                    /**
                     * Simple bind polyfill for environments that do not support it,
                     * e.g., PhantomJS 1.x. Technically, we don't need this anymore
                     * since native bind is now performant enough in most browsers.
                     * But removing it would mean breaking code that was able to run in
                     * PhantomJS 1.x, so this must be kept for backward compatibility.
                     */
                  
                    /* istanbul ignore next */
                    function polyfillBind (fn, ctx) {
                      function boundFn (a) {
                        var l = arguments.length;
                        return l
                          ? l > 1
                            ? fn.apply(ctx, arguments)
                            : fn.call(ctx, a)
                          : fn.call(ctx)
                      }
                  
                      boundFn._length = fn.length;
                      return boundFn
                    }
                  
                    function nativeBind (fn, ctx) {
                      return fn.bind(ctx)
                    }
                  
                    var bind = Function.prototype.bind
                      ? nativeBind
                      : polyfillBind;
                  
                    /**
                     * Convert an Array-like object to a real Array.
                     */
                    function toArray (list, start) {
                      start = start || 0;
                      var i = list.length - start;
                      var ret = new Array(i);
                      while (i--) {
                        ret[i] = list[i + start];
                      }
                      return ret
                    }
                  
                    /**
                     * Mix properties into target object.
                     */
                    function extend (to, _from) {
                      for (var key in _from) {
                        to[key] = _from[key];
                      }
                      return to
                    }
                  
                    /**
                     * Merge an Array of Objects into a single Object.
                     */
                    function toObject (arr) {
                      var res = {};
                      for (var i = 0; i < arr.length; i++) {
                        if (arr[i]) {
                          extend(res, arr[i]);
                        }
                      }
                      return res
                    }
                  
                    /* eslint-disable no-unused-vars */
                  
                    /**
                     * Perform no operation.
                     * Stubbing args to make Flow happy without leaving useless transpiled code
                     * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).
                     */
                    function noop (a, b, c) {}
                  
                    /**
                     * Always return false.
                     */
                    var no = function (a, b, c) { return false; };
                  
                    /* eslint-enable no-unused-vars */
                  
                    /**
                     * Return the same value.
                     */
                    var identity = function (_) { return _; };
                  
                    /**
                     * Generate a string containing static keys from compiler modules.
                     */
                    function genStaticKeys (modules) {
                      return modules.reduce(function (keys, m) {
                        return keys.concat(m.staticKeys || [])
                      }, []).join(',')
                    }
                  
                    /**
                     * Check if two values are loosely equal - that is,
                     * if they are plain objects, do they have the same shape?
                     */
                    function looseEqual (a, b) {
                      if (a === b) { return true }
                      var isObjectA = isObject(a);
                      var isObjectB = isObject(b);
                      if (isObjectA && isObjectB) {
                        try {
                          var isArrayA = Array.isArray(a);
                          var isArrayB = Array.isArray(b);
                          if (isArrayA && isArrayB) {
                            return a.length === b.length && a.every(function (e, i) {
                              return looseEqual(e, b[i])
                            })
                          } else if (a instanceof Date && b instanceof Date) {
                            return a.getTime() === b.getTime()
                          } else if (!isArrayA && !isArrayB) {
                            var keysA = Object.keys(a);
                            var keysB = Object.keys(b);
                            return keysA.length === keysB.length && keysA.every(function (key) {
                              return looseEqual(a[key], b[key])
                            })
                          } else {
                            /* istanbul ignore next */
                            return false
                          }
                        } catch (e) {
                          /* istanbul ignore next */
                          return false
                        }
                      } else if (!isObjectA && !isObjectB) {
                        return String(a) === String(b)
                      } else {
                        return false
                      }
                    }
                  
                    /**
                     * Return the first index at which a loosely equal value can be
                     * found in the array (if value is a plain object, the array must
                     * contain an object of the same shape), or -1 if it is not present.
                     */
                    function looseIndexOf (arr, val) {
                      for (var i = 0; i < arr.length; i++) {
                        if (looseEqual(arr[i], val)) { return i }
                      }
                      return -1
                    }
                  
                    /**
                     * Ensure a function is called only once.
                     */
                    function once (fn) {
                      var called = false;
                      return function () {
                        if (!called) {
                          called = true;
                          fn.apply(this, arguments);
                        }
                      }
                    }
                  
                    var SSR_ATTR = 'data-server-rendered';
                  
                    var ASSET_TYPES = [
                      'component',
                      'directive',
                      'filter'
                    ];
                  
                    var LIFECYCLE_HOOKS = [
                      'beforeCreate',
                      'created',
                      'beforeMount',
                      'mounted',
                      'beforeUpdate',
                      'updated',
                      'beforeDestroy',
                      'destroyed',
                      'activated',
                      'deactivated',
                      'errorCaptured',
                      'serverPrefetch'
                    ];
                  
                    /*  */
                  
                  
                  
                    var config = ({
                      /**
                       * Option merge strategies (used in core/util/options)
                       */
                      // $flow-disable-line
                      optionMergeStrategies: Object.create(null),
                  
                      /**
                       * Whether to suppress warnings.
                       */
                      silent: false,
                  
                      /**
                       * Show production mode tip message on boot?
                       */
                      productionTip: "development" !== 'production',
                  
                      /**
                       * Whether to enable devtools
                       */
                      devtools: "development" !== 'production',
                  
                      /**
                       * Whether to record perf
                       */
                      performance: false,
                  
                      /**
                       * Error handler for watcher errors
                       */
                      errorHandler: null,
                  
                      /**
                       * Warn handler for watcher warns
                       */
                      warnHandler: null,
                  
                      /**
                       * Ignore certain custom elements
                       */
                      ignoredElements: [],
                  
                      /**
                       * Custom user key aliases for v-on
                       */
                      // $flow-disable-line
                      keyCodes: Object.create(null),
                  
                      /**
                       * Check if a tag is reserved so that it cannot be registered as a
                       * component. This is platform-dependent and may be overwritten.
                       */
                      isReservedTag: no,
                  
                      /**
                       * Check if an attribute is reserved so that it cannot be used as a component
                       * prop. This is platform-dependent and may be overwritten.
                       */
                      isReservedAttr: no,
                  
                      /**
                       * Check if a tag is an unknown element.
                       * Platform-dependent.
                       */
                      isUnknownElement: no,
                  
                      /**
                       * Get the namespace of an element
                       */
                      getTagNamespace: noop,
                  
                      /**
                       * Parse the real tag name for the specific platform.
                       */
                      parsePlatformTagName: identity,
                  
                      /**
                       * Check if an attribute must be bound using property, e.g. value
                       * Platform-dependent.
                       */
                      mustUseProp: no,
                  
                      /**
                       * Perform updates asynchronously. Intended to be used by Vue Test Utils
                       * This will significantly reduce performance if set to false.
                       */
                      async: true,
                  
                      /**
                       * Exposed for legacy reasons
                       */
                      _lifecycleHooks: LIFECYCLE_HOOKS
                    });
                  
                    /*  */
                  
                    /**
                     * unicode letters used for parsing html tags, component names and property paths.
                     * using https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
                     * skipping \u10000-\uEFFFF due to it freezing up PhantomJS
                     */
                    var unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/;
                  
                    /**
                     * Check if a string starts with $ or _
                     */
                    function isReserved (str) {
                      var c = (str + '').charCodeAt(0);
                      return c === 0x24 || c === 0x5F
                    }
                  
                    /**
                     * Define a property.
                     */
                    function def (obj, key, val, enumerable) {
                      Object.defineProperty(obj, key, {
                        value: val,
                        enumerable: !!enumerable,
                        writable: true,
                        configurable: true
                      });
                    }
                  
                    /**
                     * Parse simple path.
                     */
                    var bailRE = new RegExp(("[^" + (unicodeRegExp.source) + ".$_\\d]"));
                    function parsePath (path) {
                      if (bailRE.test(path)) {
                        return
                      }
                      var segments = path.split('.');
                      return function (obj) {
                        for (var i = 0; i < segments.length; i++) {
                          if (!obj) { return }
                          obj = obj[segments[i]];
                        }
                        return obj
                      }
                    }
                  
                    /*  */
                  
                    // can we use __proto__?
                    var hasProto = '__proto__' in {};
                  
                    // Browser environment sniffing
                    var inBrowser = typeof window !== 'undefined';
                    var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
                    var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
                    var UA = inBrowser && window.navigator.userAgent.toLowerCase();
                    var isIE = UA && /msie|trident/.test(UA);
                    var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
                    var isEdge = UA && UA.indexOf('edge/') > 0;
                    var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
                    var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
                    var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
                    var isPhantomJS = UA && /phantomjs/.test(UA);
                    var isFF = UA && UA.match(/firefox\/(\d+)/);
                  
                    // Firefox has a "watch" function on Object.prototype...
                    var nativeWatch = ({}).watch;
                  
                    var supportsPassive = false;
                    if (inBrowser) {
                      try {
                        var opts = {};
                        Object.defineProperty(opts, 'passive', ({
                          get: function get () {
                            /* istanbul ignore next */
                            supportsPassive = true;
                          }
                        })); // https://github.com/facebook/flow/issues/285
                        window.addEventListener('test-passive', null, opts);
                      } catch (e) {}
                    }
                  
                    // this needs to be lazy-evaled because vue may be required before
                    // vue-server-renderer can set VUE_ENV
                    var _isServer;
                    var isServerRendering = function () {
                      if (_isServer === undefined) {
                        /* istanbul ignore if */
                        if (!inBrowser && !inWeex && typeof global !== 'undefined') {
                          // detect presence of vue-server-renderer and avoid
                          // Webpack shimming the process
                          _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';
                        } else {
                          _isServer = false;
                        }
                      }
                      return _isServer
                    };
                  
                    // detect devtools
                    var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
                  
                    /* istanbul ignore next */
                    function isNative (Ctor) {
                      return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
                    }
                  
                    var hasSymbol =
                      typeof Symbol !== 'undefined' && isNative(Symbol) &&
                      typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);
                  
                    var _Set;
                    /* istanbul ignore if */ // $flow-disable-line
                    if (typeof Set !== 'undefined' && isNative(Set)) {
                      // use native Set when available.
                      _Set = Set;
                    } else {
                      // a non-standard Set polyfill that only works with primitive keys.
                      _Set = /*@__PURE__*/(function () {
                        function Set () {
                          this.set = Object.create(null);
                        }
                        Set.prototype.has = function has (key) {
                          return this.set[key] === true
                        };
                        Set.prototype.add = function add (key) {
                          this.set[key] = true;
                        };
                        Set.prototype.clear = function clear () {
                          this.set = Object.create(null);
                        };
                  
                        return Set;
                      }());
                    }
                  
                    /*  */
                  
                    var warn = noop;
                    var tip = noop;
                    var generateComponentTrace = (noop); // work around flow check
                    var formatComponentName = (noop);
                  
                    {
                      var hasConsole = typeof console !== 'undefined';
                      var classifyRE = /(?:^|[-_])(\w)/g;
                      var classify = function (str) { return str
                        .replace(classifyRE, function (c) { return c.toUpperCase(); })
                        .replace(/[-_]/g, ''); };
                  
                      warn = function (msg, vm) {
                        var trace = vm ? generateComponentTrace(vm) : '';
                  
                        if (config.warnHandler) {
                          config.warnHandler.call(null, msg, vm, trace);
                        } else if (hasConsole && (!config.silent)) {
                          console.error(("[Vue warn]: " + msg + trace));
                        }
                      };
                  
                      tip = function (msg, vm) {
                        if (hasConsole && (!config.silent)) {
                          console.warn("[Vue tip]: " + msg + (
                            vm ? generateComponentTrace(vm) : ''
                          ));
                        }
                      };
                  
                      formatComponentName = function (vm, includeFile) {
                        if (vm.$root === vm) {
                          return '<Root>'
                        }
                        var options = typeof vm === 'function' && vm.cid != null
                          ? vm.options
                          : vm._isVue
                            ? vm.$options || vm.constructor.options
                            : vm;
                        var name = options.name || options._componentTag;
                        var file = options.__file;
                        if (!name && file) {
                          var match = file.match(/([^/\\]+)\.vue$/);
                          name = match && match[1];
                        }
                  
                        return (
                          (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
                          (file && includeFile !== false ? (" at " + file) : '')
                        )
                      };
                  
                      var repeat = function (str, n) {
                        var res = '';
                        while (n) {
                          if (n % 2 === 1) { res += str; }
                          if (n > 1) { str += str; }
                          n >>= 1;
                        }
                        return res
                      };
                  
                      generateComponentTrace = function (vm) {
                        if (vm._isVue && vm.$parent) {
                          var tree = [];
                          var currentRecursiveSequence = 0;
                          while (vm) {
                            if (tree.length > 0) {
                              var last = tree[tree.length - 1];
                              if (last.constructor === vm.constructor) {
                                currentRecursiveSequence++;
                                vm = vm.$parent;
                                continue
                              } else if (currentRecursiveSequence > 0) {
                                tree[tree.length - 1] = [last, currentRecursiveSequence];
                                currentRecursiveSequence = 0;
                              }
                            }
                            tree.push(vm);
                            vm = vm.$parent;
                          }
                          return '\n\nfound in\n\n' + tree
                            .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
                                ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
                                : formatComponentName(vm))); })
                            .join('\n')
                        } else {
                          return ("\n\n(found in " + (formatComponentName(vm)) + ")")
                        }
                      };
                    }
                  
                    /*  */
                  
                    var uid = 0;
                  
                    /**
                     * A dep is an observable that can have multiple
                     * directives subscribing to it.
                     */
                    var Dep = function Dep () {
                      this.id = uid++;
                      this.subs = [];
                    };
                  
                    Dep.prototype.addSub = function addSub (sub) {
                      this.subs.push(sub);
                    };
                  
                    Dep.prototype.removeSub = function removeSub (sub) {
                      remove(this.subs, sub);
                    };
                  
                    Dep.prototype.depend = function depend () {
                      if (Dep.target) {
                        Dep.target.addDep(this);
                      }
                    };
                  
                    Dep.prototype.notify = function notify () {
                      // stabilize the subscriber list first
                      var subs = this.subs.slice();
                      if (!config.async) {
                        // subs aren't sorted in scheduler if not running async
                        // we need to sort them now to make sure they fire in correct
                        // order
                        subs.sort(function (a, b) { return a.id - b.id; });
                      }
                      for (var i = 0, l = subs.length; i < l; i++) {
                        subs[i].update();
                      }
                    };
                  
                    // The current target watcher being evaluated.
                    // This is globally unique because only one watcher
                    // can be evaluated at a time.
                    Dep.target = null;
                    var targetStack = [];
                  
                    function pushTarget (target) {
                      targetStack.push(target);
                      Dep.target = target;
                    }
                  
                    function popTarget () {
                      targetStack.pop();
                      Dep.target = targetStack[targetStack.length - 1];
                    }
                  
                    /*  */
                  
                    var VNode = function VNode (
                      tag,
                      data,
                      children,
                      text,
                      elm,
                      context,
                      componentOptions,
                      asyncFactory
                    ) {
                      this.tag = tag;
                      this.data = data;
                      this.children = children;
                      this.text = text;
                      this.elm = elm;
                      this.ns = undefined;
                      this.context = context;
                      this.fnContext = undefined;
                      this.fnOptions = undefined;
                      this.fnScopeId = undefined;
                      this.key = data && data.key;
                      this.componentOptions = componentOptions;
                      this.componentInstance = undefined;
                      this.parent = undefined;
                      this.raw = false;
                      this.isStatic = false;
                      this.isRootInsert = true;
                      this.isComment = false;
                      this.isCloned = false;
                      this.isOnce = false;
                      this.asyncFactory = asyncFactory;
                      this.asyncMeta = undefined;
                      this.isAsyncPlaceholder = false;
                    };
                  
                    var prototypeAccessors = { child: { configurable: true } };
                  
                    // DEPRECATED: alias for componentInstance for backwards compat.
                    /* istanbul ignore next */
                    prototypeAccessors.child.get = function () {
                      return this.componentInstance
                    };
                  
                    Object.defineProperties( VNode.prototype, prototypeAccessors );
                  
                    var createEmptyVNode = function (text) {
                      if ( text === void 0 ) text = '';
                  
                      var node = new VNode();
                      node.text = text;
                      node.isComment = true;
                      return node
                    };
                  
                    function createTextVNode (val) {
                      return new VNode(undefined, undefined, undefined, String(val))
                    }
                  
                    // optimized shallow clone
                    // used for static nodes and slot nodes because they may be reused across
                    // multiple renders, cloning them avoids errors when DOM manipulations rely
                    // on their elm reference.
                    function cloneVNode (vnode) {
                      var cloned = new VNode(
                        vnode.tag,
                        vnode.data,
                        // #7975
                        // clone children array to avoid mutating original in case of cloning
                        // a child.
                        vnode.children && vnode.children.slice(),
                        vnode.text,
                        vnode.elm,
                        vnode.context,
                        vnode.componentOptions,
                        vnode.asyncFactory
                      );
                      cloned.ns = vnode.ns;
                      cloned.isStatic = vnode.isStatic;
                      cloned.key = vnode.key;
                      cloned.isComment = vnode.isComment;
                      cloned.fnContext = vnode.fnContext;
                      cloned.fnOptions = vnode.fnOptions;
                      cloned.fnScopeId = vnode.fnScopeId;
                      cloned.asyncMeta = vnode.asyncMeta;
                      cloned.isCloned = true;
                      return cloned
                    }
                  
                    /*
                     * not type checking this file because flow doesn't play well with
                     * dynamically accessing methods on Array prototype
                     */
                  
                    var arrayProto = Array.prototype;
                    var arrayMethods = Object.create(arrayProto);
                  
                    var methodsToPatch = [
                      'push',
                      'pop',
                      'shift',
                      'unshift',
                      'splice',
                      'sort',
                      'reverse'
                    ];
                  
                    /**
                     * Intercept mutating methods and emit events
                     */
                    methodsToPatch.forEach(function (method) {
                      // cache original method
                      var original = arrayProto[method];
                      def(arrayMethods, method, function mutator () {
                        var args = [], len = arguments.length;
                        while ( len-- ) args[ len ] = arguments[ len ];
                  
                        var result = original.apply(this, args);
                        var ob = this.__ob__;
                        var inserted;
                        switch (method) {
                          case 'push':
                          case 'unshift':
                            inserted = args;
                            break
                          case 'splice':
                            inserted = args.slice(2);
                            break
                        }
                        if (inserted) { ob.observeArray(inserted); }
                        // notify change
                        ob.dep.notify();
                        return result
                      });
                    });
                  
                    /*  */
                  
                    var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
                  
                    /**
                     * In some cases we may want to disable observation inside a component's
                     * update computation.
                     */
                    var shouldObserve = true;
                  
                    function toggleObserving (value) {
                      shouldObserve = value;
                    }
                  
                    /**
                     * Observer class that is attached to each observed
                     * object. Once attached, the observer converts the target
                     * object's property keys into getter/setters that
                     * collect dependencies and dispatch updates.
                     */
                    var Observer = function Observer (value) {
                      this.value = value;
                      this.dep = new Dep();
                      this.vmCount = 0;
                      def(value, '__ob__', this);
                      if (Array.isArray(value)) {
                        if (hasProto) {
                          protoAugment(value, arrayMethods);
                        } else {
                          copyAugment(value, arrayMethods, arrayKeys);
                        }
                        this.observeArray(value);
                      } else {
                        this.walk(value);
                      }
                    };
                  
                    /**
                     * Walk through all properties and convert them into
                     * getter/setters. This method should only be called when
                     * value type is Object.
                     */
                    Observer.prototype.walk = function walk (obj) {
                      var keys = Object.keys(obj);
                      for (var i = 0; i < keys.length; i++) {
                        defineReactive$$1(obj, keys[i]);
                      }
                    };
                  
                    /**
                     * Observe a list of Array items.
                     */
                    Observer.prototype.observeArray = function observeArray (items) {
                      for (var i = 0, l = items.length; i < l; i++) {
                        observe(items[i]);
                      }
                    };
                  
                    // helpers
                  
                    /**
                     * Augment a target Object or Array by intercepting
                     * the prototype chain using __proto__
                     */
                    function protoAugment (target, src) {
                      /* eslint-disable no-proto */
                      target.__proto__ = src;
                      /* eslint-enable no-proto */
                    }
                  
                    /**
                     * Augment a target Object or Array by defining
                     * hidden properties.
                     */
                    /* istanbul ignore next */
                    function copyAugment (target, src, keys) {
                      for (var i = 0, l = keys.length; i < l; i++) {
                        var key = keys[i];
                        def(target, key, src[key]);
                      }
                    }
                  
                    /**
                     * Attempt to create an observer instance for a value,
                     * returns the new observer if successfully observed,
                     * or the existing observer if the value already has one.
                     */
                    function observe (value, asRootData) {
                      if (!isObject(value) || value instanceof VNode) {
                        return
                      }
                      var ob;
                      if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
                        ob = value.__ob__;
                      } else if (
                        shouldObserve &&
                        !isServerRendering() &&
                        (Array.isArray(value) || isPlainObject(value)) &&
                        Object.isExtensible(value) &&
                        !value._isVue
                      ) {
                        ob = new Observer(value);
                      }
                      if (asRootData && ob) {
                        ob.vmCount++;
                      }
                      return ob
                    }
                  
                    /**
                     * Define a reactive property on an Object.
                     */
                    function defineReactive$$1 (
                      obj,
                      key,
                      val,
                      customSetter,
                      shallow
                    ) {
                      var dep = new Dep();
                  
                      var property = Object.getOwnPropertyDescriptor(obj, key);
                      if (property && property.configurable === false) {
                        return
                      }
                  
                      // cater for pre-defined getter/setters
                      var getter = property && property.get;
                      var setter = property && property.set;
                      if ((!getter || setter) && arguments.length === 2) {
                        val = obj[key];
                      }
                  
                      var childOb = !shallow && observe(val);
                      Object.defineProperty(obj, key, {
                        enumerable: true,
                        configurable: true,
                        get: function reactiveGetter () {
                          var value = getter ? getter.call(obj) : val;
                          if (Dep.target) {
                            dep.depend();
                            if (childOb) {
                              childOb.dep.depend();
                              if (Array.isArray(value)) {
                                dependArray(value);
                              }
                            }
                          }
                          return value
                        },
                        set: function reactiveSetter (newVal) {
                          var value = getter ? getter.call(obj) : val;
                          /* eslint-disable no-self-compare */
                          if (newVal === value || (newVal !== newVal && value !== value)) {
                            return
                          }
                          /* eslint-enable no-self-compare */
                          if (customSetter) {
                            customSetter();
                          }
                          // #7981: for accessor properties without setter
                          if (getter && !setter) { return }
                          if (setter) {
                            setter.call(obj, newVal);
                          } else {
                            val = newVal;
                          }
                          childOb = !shallow && observe(newVal);
                          dep.notify();
                        }
                      });
                    }
                  
                    /**
                     * Set a property on an object. Adds the new property and
                     * triggers change notification if the property doesn't
                     * already exist.
                     */
                    function set (target, key, val) {
                      if (isUndef(target) || isPrimitive(target)
                      ) {
                        warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
                      }
                      if (Array.isArray(target) && isValidArrayIndex(key)) {
                        target.length = Math.max(target.length, key);
                        target.splice(key, 1, val);
                        return val
                      }
                      if (key in target && !(key in Object.prototype)) {
                        target[key] = val;
                        return val
                      }
                      var ob = (target).__ob__;
                      if (target._isVue || (ob && ob.vmCount)) {
                        warn(
                          'Avoid adding reactive properties to a Vue instance or its root $data ' +
                          'at runtime - declare it upfront in the data option.'
                        );
                        return val
                      }
                      if (!ob) {
                        target[key] = val;
                        return val
                      }
                      defineReactive$$1(ob.value, key, val);
                      ob.dep.notify();
                      return val
                    }
                  
                    /**
                     * Delete a property and trigger change if necessary.
                     */
                    function del (target, key) {
                      if (isUndef(target) || isPrimitive(target)
                      ) {
                        warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
                      }
                      if (Array.isArray(target) && isValidArrayIndex(key)) {
                        target.splice(key, 1);
                        return
                      }
                      var ob = (target).__ob__;
                      if (target._isVue || (ob && ob.vmCount)) {
                        warn(
                          'Avoid deleting properties on a Vue instance or its root $data ' +
                          '- just set it to null.'
                        );
                        return
                      }
                      if (!hasOwn(target, key)) {
                        return
                      }
                      delete target[key];
                      if (!ob) {
                        return
                      }
                      ob.dep.notify();
                    }
                  
                    /**
                     * Collect dependencies on array elements when the array is touched, since
                     * we cannot intercept array element access like property getters.
                     */
                    function dependArray (value) {
                      for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
                        e = value[i];
                        e && e.__ob__ && e.__ob__.dep.depend();
                        if (Array.isArray(e)) {
                          dependArray(e);
                        }
                      }
                    }
                  
                    /*  */
                  
                    /**
                     * Option overwriting strategies are functions that handle
                     * how to merge a parent option value and a child option
                     * value into the final value.
                     */
                    var strats = config.optionMergeStrategies;
                  
                    /**
                     * Options with restrictions
                     */
                    {
                      strats.el = strats.propsData = function (parent, child, vm, key) {
                        if (!vm) {
                          warn(
                            "option \"" + key + "\" can only be used during instance " +
                            'creation with the `new` keyword.'
                          );
                        }
                        return defaultStrat(parent, child)
                      };
                    }
                  
                    /**
                     * Helper that recursively merges two data objects together.
                     */
                    function mergeData (to, from) {
                      if (!from) { return to }
                      var key, toVal, fromVal;
                  
                      var keys = hasSymbol
                        ? Reflect.ownKeys(from)
                        : Object.keys(from);
                  
                      for (var i = 0; i < keys.length; i++) {
                        key = keys[i];
                        // in case the object is already observed...
                        if (key === '__ob__') { continue }
                        toVal = to[key];
                        fromVal = from[key];
                        if (!hasOwn(to, key)) {
                          set(to, key, fromVal);
                        } else if (
                          toVal !== fromVal &&
                          isPlainObject(toVal) &&
                          isPlainObject(fromVal)
                        ) {
                          mergeData(toVal, fromVal);
                        }
                      }
                      return to
                    }
                  
                    /**
                     * Data
                     */
                    function mergeDataOrFn (
                      parentVal,
                      childVal,
                      vm
                    ) {
                      if (!vm) {
                        // in a Vue.extend merge, both should be functions
                        if (!childVal) {
                          return parentVal
                        }
                        if (!parentVal) {
                          return childVal
                        }
                        // when parentVal & childVal are both present,
                        // we need to return a function that returns the
                        // merged result of both functions... no need to
                        // check if parentVal is a function here because
                        // it has to be a function to pass previous merges.
                        return function mergedDataFn () {
                          return mergeData(
                            typeof childVal === 'function' ? childVal.call(this, this) : childVal,
                            typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal
                          )
                        }
                      } else {
                        return function mergedInstanceDataFn () {
                          // instance merge
                          var instanceData = typeof childVal === 'function'
                            ? childVal.call(vm, vm)
                            : childVal;
                          var defaultData = typeof parentVal === 'function'
                            ? parentVal.call(vm, vm)
                            : parentVal;
                          if (instanceData) {
                            return mergeData(instanceData, defaultData)
                          } else {
                            return defaultData
                          }
                        }
                      }
                    }
                  
                    strats.data = function (
                      parentVal,
                      childVal,
                      vm
                    ) {
                      if (!vm) {
                        if (childVal && typeof childVal !== 'function') {
                          warn(
                            'The "data" option should be a function ' +
                            'that returns a per-instance value in component ' +
                            'definitions.',
                            vm
                          );
                  
                          return parentVal
                        }
                        return mergeDataOrFn(parentVal, childVal)
                      }
                  
                      return mergeDataOrFn(parentVal, childVal, vm)
                    };
                  
                    /**
                     * Hooks and props are merged as arrays.
                     */
                    function mergeHook (
                      parentVal,
                      childVal
                    ) {
                      var res = childVal
                        ? parentVal
                          ? parentVal.concat(childVal)
                          : Array.isArray(childVal)
                            ? childVal
                            : [childVal]
                        : parentVal;
                      return res
                        ? dedupeHooks(res)
                        : res
                    }
                  
                    function dedupeHooks (hooks) {
                      var res = [];
                      for (var i = 0; i < hooks.length; i++) {
                        if (res.indexOf(hooks[i]) === -1) {
                          res.push(hooks[i]);
                        }
                      }
                      return res
                    }
                  
                    LIFECYCLE_HOOKS.forEach(function (hook) {
                      strats[hook] = mergeHook;
                    });
                  
                    /**
                     * Assets
                     *
                     * When a vm is present (instance creation), we need to do
                     * a three-way merge between constructor options, instance
                     * options and parent options.
                     */
                    function mergeAssets (
                      parentVal,
                      childVal,
                      vm,
                      key
                    ) {
                      var res = Object.create(parentVal || null);
                      if (childVal) {
                        assertObjectType(key, childVal, vm);
                        return extend(res, childVal)
                      } else {
                        return res
                      }
                    }
                  
                    ASSET_TYPES.forEach(function (type) {
                      strats[type + 's'] = mergeAssets;
                    });
                  
                    /**
                     * Watchers.
                     *
                     * Watchers hashes should not overwrite one
                     * another, so we merge them as arrays.
                     */
                    strats.watch = function (
                      parentVal,
                      childVal,
                      vm,
                      key
                    ) {
                      // work around Firefox's Object.prototype.watch...
                      if (parentVal === nativeWatch) { parentVal = undefined; }
                      if (childVal === nativeWatch) { childVal = undefined; }
                      /* istanbul ignore if */
                      if (!childVal) { return Object.create(parentVal || null) }
                      {
                        assertObjectType(key, childVal, vm);
                      }
                      if (!parentVal) { return childVal }
                      var ret = {};
                      extend(ret, parentVal);
                      for (var key$1 in childVal) {
                        var parent = ret[key$1];
                        var child = childVal[key$1];
                        if (parent && !Array.isArray(parent)) {
                          parent = [parent];
                        }
                        ret[key$1] = parent
                          ? parent.concat(child)
                          : Array.isArray(child) ? child : [child];
                      }
                      return ret
                    };
                  
                    /**
                     * Other object hashes.
                     */
                    strats.props =
                    strats.methods =
                    strats.inject =
                    strats.computed = function (
                      parentVal,
                      childVal,
                      vm,
                      key
                    ) {
                      if (childVal && "development" !== 'production') {
                        assertObjectType(key, childVal, vm);
                      }
                      if (!parentVal) { return childVal }
                      var ret = Object.create(null);
                      extend(ret, parentVal);
                      if (childVal) { extend(ret, childVal); }
                      return ret
                    };
                    strats.provide = mergeDataOrFn;
                  
                    /**
                     * Default strategy.
                     */
                    var defaultStrat = function (parentVal, childVal) {
                      return childVal === undefined
                        ? parentVal
                        : childVal
                    };
                  
                    /**
                     * Validate component names
                     */
                    function checkComponents (options) {
                      for (var key in options.components) {
                        validateComponentName(key);
                      }
                    }
                  
                    function validateComponentName (name) {
                      if (!new RegExp(("^[a-zA-Z][\\-\\.0-9_" + (unicodeRegExp.source) + "]*$")).test(name)) {
                        warn(
                          'Invalid component name: "' + name + '". Component names ' +
                          'should conform to valid custom element name in html5 specification.'
                        );
                      }
                      if (isBuiltInTag(name) || config.isReservedTag(name)) {
                        warn(
                          'Do not use built-in or reserved HTML elements as component ' +
                          'id: ' + name
                        );
                      }
                    }
                  
                    /**
                     * Ensure all props option syntax are normalized into the
                     * Object-based format.
                     */
                    function normalizeProps (options, vm) {
                      var props = options.props;
                      if (!props) { return }
                      var res = {};
                      var i, val, name;
                      if (Array.isArray(props)) {
                        i = props.length;
                        while (i--) {
                          val = props[i];
                          if (typeof val === 'string') {
                            name = camelize(val);
                            res[name] = { type: null };
                          } else {
                            warn('props must be strings when using array syntax.');
                          }
                        }
                      } else if (isPlainObject(props)) {
                        for (var key in props) {
                          val = props[key];
                          name = camelize(key);
                          res[name] = isPlainObject(val)
                            ? val
                            : { type: val };
                        }
                      } else {
                        warn(
                          "Invalid value for option \"props\": expected an Array or an Object, " +
                          "but got " + (toRawType(props)) + ".",
                          vm
                        );
                      }
                      options.props = res;
                    }
                  
                    /**
                     * Normalize all injections into Object-based format
                     */
                    function normalizeInject (options, vm) {
                      var inject = options.inject;
                      if (!inject) { return }
                      var normalized = options.inject = {};
                      if (Array.isArray(inject)) {
                        for (var i = 0; i < inject.length; i++) {
                          normalized[inject[i]] = { from: inject[i] };
                        }
                      } else if (isPlainObject(inject)) {
                        for (var key in inject) {
                          var val = inject[key];
                          normalized[key] = isPlainObject(val)
                            ? extend({ from: key }, val)
                            : { from: val };
                        }
                      } else {
                        warn(
                          "Invalid value for option \"inject\": expected an Array or an Object, " +
                          "but got " + (toRawType(inject)) + ".",
                          vm
                        );
                      }
                    }
                  
                    /**
                     * Normalize raw function directives into object format.
                     */
                    function normalizeDirectives (options) {
                      var dirs = options.directives;
                      if (dirs) {
                        for (var key in dirs) {
                          var def$$1 = dirs[key];
                          if (typeof def$$1 === 'function') {
                            dirs[key] = { bind: def$$1, update: def$$1 };
                          }
                        }
                      }
                    }
                  
                    function assertObjectType (name, value, vm) {
                      if (!isPlainObject(value)) {
                        warn(
                          "Invalid value for option \"" + name + "\": expected an Object, " +
                          "but got " + (toRawType(value)) + ".",
                          vm
                        );
                      }
                    }
                  
                    /**
                     * Merge two option objects into a new one.
                     * Core utility used in both instantiation and inheritance.
                     */
                    function mergeOptions (
                      parent,
                      child,
                      vm
                    ) {
                      {
                        checkComponents(child);
                      }
                  
                      if (typeof child === 'function') {
                        child = child.options;
                      }
                  
                      normalizeProps(child, vm);
                      normalizeInject(child, vm);
                      normalizeDirectives(child);
                  
                      // Apply extends and mixins on the child options,
                      // but only if it is a raw options object that isn't
                      // the result of another mergeOptions call.
                      // Only merged options has the _base property.
                      if (!child._base) {
                        if (child.extends) {
                          parent = mergeOptions(parent, child.extends, vm);
                        }
                        if (child.mixins) {
                          for (var i = 0, l = child.mixins.length; i < l; i++) {
                            parent = mergeOptions(parent, child.mixins[i], vm);
                          }
                        }
                      }
                  
                      var options = {};
                      var key;
                      for (key in parent) {
                        mergeField(key);
                      }
                      for (key in child) {
                        if (!hasOwn(parent, key)) {
                          mergeField(key);
                        }
                      }
                      function mergeField (key) {
                        var strat = strats[key] || defaultStrat;
                        options[key] = strat(parent[key], child[key], vm, key);
                      }
                      return options
                    }
                  
                    /**
                     * Resolve an asset.
                     * This function is used because child instances need access
                     * to assets defined in its ancestor chain.
                     */
                    function resolveAsset (
                      options,
                      type,
                      id,
                      warnMissing
                    ) {
                      /* istanbul ignore if */
                      if (typeof id !== 'string') {
                        return
                      }
                      var assets = options[type];
                      // check local registration variations first
                      if (hasOwn(assets, id)) { return assets[id] }
                      var camelizedId = camelize(id);
                      if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
                      var PascalCaseId = capitalize(camelizedId);
                      if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
                      // fallback to prototype chain
                      var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
                      if (warnMissing && !res) {
                        warn(
                          'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
                          options
                        );
                      }
                      return res
                    }
                  
                    /*  */
                  
                  
                  
                    function validateProp (
                      key,
                      propOptions,
                      propsData,
                      vm
                    ) {
                      var prop = propOptions[key];
                      var absent = !hasOwn(propsData, key);
                      var value = propsData[key];
                      // boolean casting
                      var booleanIndex = getTypeIndex(Boolean, prop.type);
                      if (booleanIndex > -1) {
                        if (absent && !hasOwn(prop, 'default')) {
                          value = false;
                        } else if (value === '' || value === hyphenate(key)) {
                          // only cast empty string / same name to boolean if
                          // boolean has higher priority
                          var stringIndex = getTypeIndex(String, prop.type);
                          if (stringIndex < 0 || booleanIndex < stringIndex) {
                            value = true;
                          }
                        }
                      }
                      // check default value
                      if (value === undefined) {
                        value = getPropDefaultValue(vm, prop, key);
                        // since the default value is a fresh copy,
                        // make sure to observe it.
                        var prevShouldObserve = shouldObserve;
                        toggleObserving(true);
                        observe(value);
                        toggleObserving(prevShouldObserve);
                      }
                      {
                        assertProp(prop, key, value, vm, absent);
                      }
                      return value
                    }
                  
                    /**
                     * Get the default value of a prop.
                     */
                    function getPropDefaultValue (vm, prop, key) {
                      // no default, return undefined
                      if (!hasOwn(prop, 'default')) {
                        return undefined
                      }
                      var def = prop.default;
                      // warn against non-factory defaults for Object & Array
                      if (isObject(def)) {
                        warn(
                          'Invalid default value for prop "' + key + '": ' +
                          'Props with type Object/Array must use a factory function ' +
                          'to return the default value.',
                          vm
                        );
                      }
                      // the raw prop value was also undefined from previous render,
                      // return previous default value to avoid unnecessary watcher trigger
                      if (vm && vm.$options.propsData &&
                        vm.$options.propsData[key] === undefined &&
                        vm._props[key] !== undefined
                      ) {
                        return vm._props[key]
                      }
                      // call factory function for non-Function types
                      // a value is Function if its prototype is function even across different execution context
                      return typeof def === 'function' && getType(prop.type) !== 'Function'
                        ? def.call(vm)
                        : def
                    }
                  
                    /**
                     * Assert whether a prop is valid.
                     */
                    function assertProp (
                      prop,
                      name,
                      value,
                      vm,
                      absent
                    ) {
                      if (prop.required && absent) {
                        warn(
                          'Missing required prop: "' + name + '"',
                          vm
                        );
                        return
                      }
                      if (value == null && !prop.required) {
                        return
                      }
                      var type = prop.type;
                      var valid = !type || type === true;
                      var expectedTypes = [];
                      if (type) {
                        if (!Array.isArray(type)) {
                          type = [type];
                        }
                        for (var i = 0; i < type.length && !valid; i++) {
                          var assertedType = assertType(value, type[i]);
                          expectedTypes.push(assertedType.expectedType || '');
                          valid = assertedType.valid;
                        }
                      }
                  
                      if (!valid) {
                        warn(
                          getInvalidTypeMessage(name, value, expectedTypes),
                          vm
                        );
                        return
                      }
                      var validator = prop.validator;
                      if (validator) {
                        if (!validator(value)) {
                          warn(
                            'Invalid prop: custom validator check failed for prop "' + name + '".',
                            vm
                          );
                        }
                      }
                    }
                  
                    var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;
                  
                    function assertType (value, type) {
                      var valid;
                      var expectedType = getType(type);
                      if (simpleCheckRE.test(expectedType)) {
                        var t = typeof value;
                        valid = t === expectedType.toLowerCase();
                        // for primitive wrapper objects
                        if (!valid && t === 'object') {
                          valid = value instanceof type;
                        }
                      } else if (expectedType === 'Object') {
                        valid = isPlainObject(value);
                      } else if (expectedType === 'Array') {
                        valid = Array.isArray(value);
                      } else {
                        valid = value instanceof type;
                      }
                      return {
                        valid: valid,
                        expectedType: expectedType
                      }
                    }
                  
                    /**
                     * Use function string name to check built-in types,
                     * because a simple equality check will fail when running
                     * across different vms / iframes.
                     */
                    function getType (fn) {
                      var match = fn && fn.toString().match(/^\s*function (\w+)/);
                      return match ? match[1] : ''
                    }
                  
                    function isSameType (a, b) {
                      return getType(a) === getType(b)
                    }
                  
                    function getTypeIndex (type, expectedTypes) {
                      if (!Array.isArray(expectedTypes)) {
                        return isSameType(expectedTypes, type) ? 0 : -1
                      }
                      for (var i = 0, len = expectedTypes.length; i < len; i++) {
                        if (isSameType(expectedTypes[i], type)) {
                          return i
                        }
                      }
                      return -1
                    }
                  
                    function getInvalidTypeMessage (name, value, expectedTypes) {
                      var message = "Invalid prop: type check failed for prop \"" + name + "\"." +
                        " Expected " + (expectedTypes.map(capitalize).join(', '));
                      var expectedType = expectedTypes[0];
                      var receivedType = toRawType(value);
                      var expectedValue = styleValue(value, expectedType);
                      var receivedValue = styleValue(value, receivedType);
                      // check if we need to specify expected value
                      if (expectedTypes.length === 1 &&
                          isExplicable(expectedType) &&
                          !isBoolean(expectedType, receivedType)) {
                        message += " with value " + expectedValue;
                      }
                      message += ", got " + receivedType + " ";
                      // check if we need to specify received value
                      if (isExplicable(receivedType)) {
                        message += "with value " + receivedValue + ".";
                      }
                      return message
                    }
                  
                    function styleValue (value, type) {
                      if (type === 'String') {
                        return ("\"" + value + "\"")
                      } else if (type === 'Number') {
                        return ("" + (Number(value)))
                      } else {
                        return ("" + value)
                      }
                    }
                  
                    function isExplicable (value) {
                      var explicitTypes = ['string', 'number', 'boolean'];
                      return explicitTypes.some(function (elem) { return value.toLowerCase() === elem; })
                    }
                  
                    function isBoolean () {
                      var args = [], len = arguments.length;
                      while ( len-- ) args[ len ] = arguments[ len ];
                  
                      return args.some(function (elem) { return elem.toLowerCase() === 'boolean'; })
                    }
                  
                    /*  */
                  
                    function handleError (err, vm, info) {
                      // Deactivate deps tracking while processing error handler to avoid possible infinite rendering.
                      // See: https://github.com/vuejs/vuex/issues/1505
                      pushTarget();
                      try {
                        if (vm) {
                          var cur = vm;
                          while ((cur = cur.$parent)) {
                            var hooks = cur.$options.errorCaptured;
                            if (hooks) {
                              for (var i = 0; i < hooks.length; i++) {
                                try {
                                  var capture = hooks[i].call(cur, err, vm, info) === false;
                                  if (capture) { return }
                                } catch (e) {
                                  globalHandleError(e, cur, 'errorCaptured hook');
                                }
                              }
                            }
                          }
                        }
                        globalHandleError(err, vm, info);
                      } finally {
                        popTarget();
                      }
                    }
                  
                    function invokeWithErrorHandling (
                      handler,
                      context,
                      args,
                      vm,
                      info
                    ) {
                      var res;
                      try {
                        res = args ? handler.apply(context, args) : handler.call(context);
                        if (res && !res._isVue && isPromise(res) && !res._handled) {
                          res.catch(function (e) { return handleError(e, vm, info + " (Promise/async)"); });
                          // issue #9511
                          // avoid catch triggering multiple times when nested calls
                          res._handled = true;
                        }
                      } catch (e) {
                        handleError(e, vm, info);
                      }
                      return res
                    }
                  
                    function globalHandleError (err, vm, info) {
                      if (config.errorHandler) {
                        try {
                          return config.errorHandler.call(null, err, vm, info)
                        } catch (e) {
                          // if the user intentionally throws the original error in the handler,
                          // do not log it twice
                          if (e !== err) {
                            logError(e, null, 'config.errorHandler');
                          }
                        }
                      }
                      logError(err, vm, info);
                    }
                  
                    function logError (err, vm, info) {
                      {
                        warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
                      }
                      /* istanbul ignore else */
                      if ((inBrowser || inWeex) && typeof console !== 'undefined') {
                        console.error(err);
                      } else {
                        throw err
                      }
                    }
                  
                    /*  */
                  
                    var isUsingMicroTask = false;
                  
                    var callbacks = [];
                    var pending = false;
                  
                    function flushCallbacks () {
                      pending = false;
                      var copies = callbacks.slice(0);
                      callbacks.length = 0;
                      for (var i = 0; i < copies.length; i++) {
                        copies[i]();
                      }
                    }
                  
                    // Here we have async deferring wrappers using microtasks.
                    // In 2.5 we used (macro) tasks (in combination with microtasks).
                    // However, it has subtle problems when state is changed right before repaint
                    // (e.g. #6813, out-in transitions).
                    // Also, using (macro) tasks in event handler would cause some weird behaviors
                    // that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
                    // So we now use microtasks everywhere, again.
                    // A major drawback of this tradeoff is that there are some scenarios
                    // where microtasks have too high a priority and fire in between supposedly
                    // sequential events (e.g. #4521, #6690, which have workarounds)
                    // or even between bubbling of the same event (#6566).
                    var timerFunc;
                  
                    // The nextTick behavior leverages the microtask queue, which can be accessed
                    // via either native Promise.then or MutationObserver.
                    // MutationObserver has wider support, however it is seriously bugged in
                    // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
                    // completely stops working after triggering a few times... so, if native
                    // Promise is available, we will use it:
                    /* istanbul ignore next, $flow-disable-line */
                    if (typeof Promise !== 'undefined' && isNative(Promise)) {
                      var p = Promise.resolve();
                      timerFunc = function () {
                        p.then(flushCallbacks);
                        // In problematic UIWebViews, Promise.then doesn't completely break, but
                        // it can get stuck in a weird state where callbacks are pushed into the
                        // microtask queue but the queue isn't being flushed, until the browser
                        // needs to do some other work, e.g. handle a timer. Therefore we can
                        // "force" the microtask queue to be flushed by adding an empty timer.
                        if (isIOS) { setTimeout(noop); }
                      };
                      isUsingMicroTask = true;
                    } else if (!isIE && typeof MutationObserver !== 'undefined' && (
                      isNative(MutationObserver) ||
                      // PhantomJS and iOS 7.x
                      MutationObserver.toString() === '[object MutationObserverConstructor]'
                    )) {
                      // Use MutationObserver where native Promise is not available,
                      // e.g. PhantomJS, iOS7, Android 4.4
                      // (#6466 MutationObserver is unreliable in IE11)
                      var counter = 1;
                      var observer = new MutationObserver(flushCallbacks);
                      var textNode = document.createTextNode(String(counter));
                      observer.observe(textNode, {
                        characterData: true
                      });
                      timerFunc = function () {
                        counter = (counter + 1) % 2;
                        textNode.data = String(counter);
                      };
                      isUsingMicroTask = true;
                    } else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
                      // Fallback to setImmediate.
                      // Technically it leverages the (macro) task queue,
                      // but it is still a better choice than setTimeout.
                      timerFunc = function () {
                        setImmediate(flushCallbacks);
                      };
                    } else {
                      // Fallback to setTimeout.
                      timerFunc = function () {
                        setTimeout(flushCallbacks, 0);
                      };
                    }
                  
                    function nextTick (cb, ctx) {
                      var _resolve;
                      callbacks.push(function () {
                        if (cb) {
                          try {
                            cb.call(ctx);
                          } catch (e) {
                            handleError(e, ctx, 'nextTick');
                          }
                        } else if (_resolve) {
                          _resolve(ctx);
                        }
                      });
                      if (!pending) {
                        pending = true;
                        timerFunc();
                      }
                      // $flow-disable-line
                      if (!cb && typeof Promise !== 'undefined') {
                        return new Promise(function (resolve) {
                          _resolve = resolve;
                        })
                      }
                    }
                  
                    /*  */
                  
                    var mark;
                    var measure;
                  
                    {
                      var perf = inBrowser && window.performance;
                      /* istanbul ignore if */
                      if (
                        perf &&
                        perf.mark &&
                        perf.measure &&
                        perf.clearMarks &&
                        perf.clearMeasures
                      ) {
                        mark = function (tag) { return perf.mark(tag); };
                        measure = function (name, startTag, endTag) {
                          perf.measure(name, startTag, endTag);
                          perf.clearMarks(startTag);
                          perf.clearMarks(endTag);
                          // perf.clearMeasures(name)
                        };
                      }
                    }
                  
                    /* not type checking this file because flow doesn't play well with Proxy */
                  
                    var initProxy;
                  
                    {
                      var allowedGlobals = makeMap(
                        'Infinity,undefined,NaN,isFinite,isNaN,' +
                        'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
                        'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
                        'require' // for Webpack/Browserify
                      );
                  
                      var warnNonPresent = function (target, key) {
                        warn(
                          "Property or method \"" + key + "\" is not defined on the instance but " +
                          'referenced during render. Make sure that this property is reactive, ' +
                          'either in the data option, or for class-based components, by ' +
                          'initializing the property. ' +
                          'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
                          target
                        );
                      };
                  
                      var warnReservedPrefix = function (target, key) {
                        warn(
                          "Property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
                          'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
                          'prevent conflicts with Vue internals. ' +
                          'See: https://vuejs.org/v2/api/#data',
                          target
                        );
                      };
                  
                      var hasProxy =
                        typeof Proxy !== 'undefined' && isNative(Proxy);
                  
                      if (hasProxy) {
                        var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
                        config.keyCodes = new Proxy(config.keyCodes, {
                          set: function set (target, key, value) {
                            if (isBuiltInModifier(key)) {
                              warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                              return false
                            } else {
                              target[key] = value;
                              return true
                            }
                          }
                        });
                      }
                  
                      var hasHandler = {
                        has: function has (target, key) {
                          var has = key in target;
                          var isAllowed = allowedGlobals(key) ||
                            (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));
                          if (!has && !isAllowed) {
                            if (key in target.$data) { warnReservedPrefix(target, key); }
                            else { warnNonPresent(target, key); }
                          }
                          return has || !isAllowed
                        }
                      };
                  
                      var getHandler = {
                        get: function get (target, key) {
                          if (typeof key === 'string' && !(key in target)) {
                            if (key in target.$data) { warnReservedPrefix(target, key); }
                            else { warnNonPresent(target, key); }
                          }
                          return target[key]
                        }
                      };
                  
                      initProxy = function initProxy (vm) {
                        if (hasProxy) {
                          // determine which proxy handler to use
                          var options = vm.$options;
                          var handlers = options.render && options.render._withStripped
                            ? getHandler
                            : hasHandler;
                          vm._renderProxy = new Proxy(vm, handlers);
                        } else {
                          vm._renderProxy = vm;
                        }
                      };
                    }
                  
                    /*  */
                  
                    var seenObjects = new _Set();
                  
                    /**
                     * Recursively traverse an object to evoke all converted
                     * getters, so that every nested property inside the object
                     * is collected as a "deep" dependency.
                     */
                    function traverse (val) {
                      _traverse(val, seenObjects);
                      seenObjects.clear();
                    }
                  
                    function _traverse (val, seen) {
                      var i, keys;
                      var isA = Array.isArray(val);
                      if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
                        return
                      }
                      if (val.__ob__) {
                        var depId = val.__ob__.dep.id;
                        if (seen.has(depId)) {
                          return
                        }
                        seen.add(depId);
                      }
                      if (isA) {
                        i = val.length;
                        while (i--) { _traverse(val[i], seen); }
                      } else {
                        keys = Object.keys(val);
                        i = keys.length;
                        while (i--) { _traverse(val[keys[i]], seen); }
                      }
                    }
                  
                    /*  */
                  
                    var normalizeEvent = cached(function (name) {
                      var passive = name.charAt(0) === '&';
                      name = passive ? name.slice(1) : name;
                      var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
                      name = once$$1 ? name.slice(1) : name;
                      var capture = name.charAt(0) === '!';
                      name = capture ? name.slice(1) : name;
                      return {
                        name: name,
                        once: once$$1,
                        capture: capture,
                        passive: passive
                      }
                    });
                  
                    function createFnInvoker (fns, vm) {
                      function invoker () {
                        var arguments$1 = arguments;
                  
                        var fns = invoker.fns;
                        if (Array.isArray(fns)) {
                          var cloned = fns.slice();
                          for (var i = 0; i < cloned.length; i++) {
                            invokeWithErrorHandling(cloned[i], null, arguments$1, vm, "v-on handler");
                          }
                        } else {
                          // return handler return value for single handlers
                          return invokeWithErrorHandling(fns, null, arguments, vm, "v-on handler")
                        }
                      }
                      invoker.fns = fns;
                      return invoker
                    }
                  
                    function updateListeners (
                      on,
                      oldOn,
                      add,
                      remove$$1,
                      createOnceHandler,
                      vm
                    ) {
                      var name, def$$1, cur, old, event;
                      for (name in on) {
                        def$$1 = cur = on[name];
                        old = oldOn[name];
                        event = normalizeEvent(name);
                        if (isUndef(cur)) {
                          warn(
                            "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                            vm
                          );
                        } else if (isUndef(old)) {
                          if (isUndef(cur.fns)) {
                            cur = on[name] = createFnInvoker(cur, vm);
                          }
                          if (isTrue(event.once)) {
                            cur = on[name] = createOnceHandler(event.name, cur, event.capture);
                          }
                          add(event.name, cur, event.capture, event.passive, event.params);
                        } else if (cur !== old) {
                          old.fns = cur;
                          on[name] = old;
                        }
                      }
                      for (name in oldOn) {
                        if (isUndef(on[name])) {
                          event = normalizeEvent(name);
                          remove$$1(event.name, oldOn[name], event.capture);
                        }
                      }
                    }
                  
                    /*  */
                  
                    function mergeVNodeHook (def, hookKey, hook) {
                      if (def instanceof VNode) {
                        def = def.data.hook || (def.data.hook = {});
                      }
                      var invoker;
                      var oldHook = def[hookKey];
                  
                      function wrappedHook () {
                        hook.apply(this, arguments);
                        // important: remove merged hook to ensure it's called only once
                        // and prevent memory leak
                        remove(invoker.fns, wrappedHook);
                      }
                  
                      if (isUndef(oldHook)) {
                        // no existing hook
                        invoker = createFnInvoker([wrappedHook]);
                      } else {
                        /* istanbul ignore if */
                        if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
                          // already a merged invoker
                          invoker = oldHook;
                          invoker.fns.push(wrappedHook);
                        } else {
                          // existing plain hook
                          invoker = createFnInvoker([oldHook, wrappedHook]);
                        }
                      }
                  
                      invoker.merged = true;
                      def[hookKey] = invoker;
                    }
                  
                    /*  */
                  
                    function extractPropsFromVNodeData (
                      data,
                      Ctor,
                      tag
                    ) {
                      // we are only extracting raw values here.
                      // validation and default values are handled in the child
                      // component itself.
                      var propOptions = Ctor.options.props;
                      if (isUndef(propOptions)) {
                        return
                      }
                      var res = {};
                      var attrs = data.attrs;
                      var props = data.props;
                      if (isDef(attrs) || isDef(props)) {
                        for (var key in propOptions) {
                          var altKey = hyphenate(key);
                          {
                            var keyInLowerCase = key.toLowerCase();
                            if (
                              key !== keyInLowerCase &&
                              attrs && hasOwn(attrs, keyInLowerCase)
                            ) {
                              tip(
                                "Prop \"" + keyInLowerCase + "\" is passed to component " +
                                (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
                                " \"" + key + "\". " +
                                "Note that HTML attributes are case-insensitive and camelCased " +
                                "props need to use their kebab-case equivalents when using in-DOM " +
                                "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
                              );
                            }
                          }
                          checkProp(res, props, key, altKey, true) ||
                          checkProp(res, attrs, key, altKey, false);
                        }
                      }
                      return res
                    }
                  
                    function checkProp (
                      res,
                      hash,
                      key,
                      altKey,
                      preserve
                    ) {
                      if (isDef(hash)) {
                        if (hasOwn(hash, key)) {
                          res[key] = hash[key];
                          if (!preserve) {
                            delete hash[key];
                          }
                          return true
                        } else if (hasOwn(hash, altKey)) {
                          res[key] = hash[altKey];
                          if (!preserve) {
                            delete hash[altKey];
                          }
                          return true
                        }
                      }
                      return false
                    }
                  
                    /*  */
                  
                    // The template compiler attempts to minimize the need for normalization by
                    // statically analyzing the template at compile time.
                    //
                    // For plain HTML markup, normalization can be completely skipped because the
                    // generated render function is guaranteed to return Array<VNode>. There are
                    // two cases where extra normalization is needed:
                  
                    // 1. When the children contains components - because a functional component
                    // may return an Array instead of a single root. In this case, just a simple
                    // normalization is needed - if any child is an Array, we flatten the whole
                    // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
                    // because functional components already normalize their own children.
                    function simpleNormalizeChildren (children) {
                      for (var i = 0; i < children.length; i++) {
                        if (Array.isArray(children[i])) {
                          return Array.prototype.concat.apply([], children)
                        }
                      }
                      return children
                    }
                  
                    // 2. When the children contains constructs that always generated nested Arrays,
                    // e.g. <template>, <slot>, v-for, or when the children is provided by user
                    // with hand-written render functions / JSX. In such cases a full normalization
                    // is needed to cater to all possible types of children values.
                    function normalizeChildren (children) {
                      return isPrimitive(children)
                        ? [createTextVNode(children)]
                        : Array.isArray(children)
                          ? normalizeArrayChildren(children)
                          : undefined
                    }
                  
                    function isTextNode (node) {
                      return isDef(node) && isDef(node.text) && isFalse(node.isComment)
                    }
                  
                    function normalizeArrayChildren (children, nestedIndex) {
                      var res = [];
                      var i, c, lastIndex, last;
                      for (i = 0; i < children.length; i++) {
                        c = children[i];
                        if (isUndef(c) || typeof c === 'boolean') { continue }
                        lastIndex = res.length - 1;
                        last = res[lastIndex];
                        //  nested
                        if (Array.isArray(c)) {
                          if (c.length > 0) {
                            c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
                            // merge adjacent text nodes
                            if (isTextNode(c[0]) && isTextNode(last)) {
                              res[lastIndex] = createTextVNode(last.text + (c[0]).text);
                              c.shift();
                            }
                            res.push.apply(res, c);
                          }
                        } else if (isPrimitive(c)) {
                          if (isTextNode(last)) {
                            // merge adjacent text nodes
                            // this is necessary for SSR hydration because text nodes are
                            // essentially merged when rendered to HTML strings
                            res[lastIndex] = createTextVNode(last.text + c);
                          } else if (c !== '') {
                            // convert primitive to vnode
                            res.push(createTextVNode(c));
                          }
                        } else {
                          if (isTextNode(c) && isTextNode(last)) {
                            // merge adjacent text nodes
                            res[lastIndex] = createTextVNode(last.text + c.text);
                          } else {
                            // default key for nested array children (likely generated by v-for)
                            if (isTrue(children._isVList) &&
                              isDef(c.tag) &&
                              isUndef(c.key) &&
                              isDef(nestedIndex)) {
                              c.key = "__vlist" + nestedIndex + "_" + i + "__";
                            }
                            res.push(c);
                          }
                        }
                      }
                      return res
                    }
                  
                    /*  */
                  
                    function initProvide (vm) {
                      var provide = vm.$options.provide;
                      if (provide) {
                        vm._provided = typeof provide === 'function'
                          ? provide.call(vm)
                          : provide;
                      }
                    }
                  
                    function initInjections (vm) {
                      var result = resolveInject(vm.$options.inject, vm);
                      if (result) {
                        toggleObserving(false);
                        Object.keys(result).forEach(function (key) {
                          /* istanbul ignore else */
                          {
                            defineReactive$$1(vm, key, result[key], function () {
                              warn(
                                "Avoid mutating an injected value directly since the changes will be " +
                                "overwritten whenever the provided component re-renders. " +
                                "injection being mutated: \"" + key + "\"",
                                vm
                              );
                            });
                          }
                        });
                        toggleObserving(true);
                      }
                    }
                  
                    function resolveInject (inject, vm) {
                      if (inject) {
                        // inject is :any because flow is not smart enough to figure out cached
                        var result = Object.create(null);
                        var keys = hasSymbol
                          ? Reflect.ownKeys(inject)
                          : Object.keys(inject);
                  
                        for (var i = 0; i < keys.length; i++) {
                          var key = keys[i];
                          // #6574 in case the inject object is observed...
                          if (key === '__ob__') { continue }
                          var provideKey = inject[key].from;
                          var source = vm;
                          while (source) {
                            if (source._provided && hasOwn(source._provided, provideKey)) {
                              result[key] = source._provided[provideKey];
                              break
                            }
                            source = source.$parent;
                          }
                          if (!source) {
                            if ('default' in inject[key]) {
                              var provideDefault = inject[key].default;
                              result[key] = typeof provideDefault === 'function'
                                ? provideDefault.call(vm)
                                : provideDefault;
                            } else {
                              warn(("Injection \"" + key + "\" not found"), vm);
                            }
                          }
                        }
                        return result
                      }
                    }
                  
                    /*  */
                  
                  
                  
                    /**
                     * Runtime helper for resolving raw children VNodes into a slot object.
                     */
                    function resolveSlots (
                      children,
                      context
                    ) {
                      if (!children || !children.length) {
                        return {}
                      }
                      var slots = {};
                      for (var i = 0, l = children.length; i < l; i++) {
                        var child = children[i];
                        var data = child.data;
                        // remove slot attribute if the node is resolved as a Vue slot node
                        if (data && data.attrs && data.attrs.slot) {
                          delete data.attrs.slot;
                        }
                        // named slots should only be respected if the vnode was rendered in the
                        // same context.
                        if ((child.context === context || child.fnContext === context) &&
                          data && data.slot != null
                        ) {
                          var name = data.slot;
                          var slot = (slots[name] || (slots[name] = []));
                          if (child.tag === 'template') {
                            slot.push.apply(slot, child.children || []);
                          } else {
                            slot.push(child);
                          }
                        } else {
                          (slots.default || (slots.default = [])).push(child);
                        }
                      }
                      // ignore slots that contains only whitespace
                      for (var name$1 in slots) {
                        if (slots[name$1].every(isWhitespace)) {
                          delete slots[name$1];
                        }
                      }
                      return slots
                    }
                  
                    function isWhitespace (node) {
                      return (node.isComment && !node.asyncFactory) || node.text === ' '
                    }
                  
                    /*  */
                  
                    function normalizeScopedSlots (
                      slots,
                      normalSlots,
                      prevSlots
                    ) {
                      var res;
                      var hasNormalSlots = Object.keys(normalSlots).length > 0;
                      var isStable = slots ? !!slots.$stable : !hasNormalSlots;
                      var key = slots && slots.$key;
                      if (!slots) {
                        res = {};
                      } else if (slots._normalized) {
                        // fast path 1: child component re-render only, parent did not change
                        return slots._normalized
                      } else if (
                        isStable &&
                        prevSlots &&
                        prevSlots !== emptyObject &&
                        key === prevSlots.$key &&
                        !hasNormalSlots &&
                        !prevSlots.$hasNormal
                      ) {
                        // fast path 2: stable scoped slots w/ no normal slots to proxy,
                        // only need to normalize once
                        return prevSlots
                      } else {
                        res = {};
                        for (var key$1 in slots) {
                          if (slots[key$1] && key$1[0] !== '$') {
                            res[key$1] = normalizeScopedSlot(normalSlots, key$1, slots[key$1]);
                          }
                        }
                      }
                      // expose normal slots on scopedSlots
                      for (var key$2 in normalSlots) {
                        if (!(key$2 in res)) {
                          res[key$2] = proxyNormalSlot(normalSlots, key$2);
                        }
                      }
                      // avoriaz seems to mock a non-extensible $scopedSlots object
                      // and when that is passed down this would cause an error
                      if (slots && Object.isExtensible(slots)) {
                        (slots)._normalized = res;
                      }
                      def(res, '$stable', isStable);
                      def(res, '$key', key);
                      def(res, '$hasNormal', hasNormalSlots);
                      return res
                    }
                  
                    function normalizeScopedSlot(normalSlots, key, fn) {
                      var normalized = function () {
                        var res = arguments.length ? fn.apply(null, arguments) : fn({});
                        res = res && typeof res === 'object' && !Array.isArray(res)
                          ? [res] // single vnode
                          : normalizeChildren(res);
                        return res && (
                          res.length === 0 ||
                          (res.length === 1 && res[0].isComment) // #9658
                        ) ? undefined
                          : res
                      };
                      // this is a slot using the new v-slot syntax without scope. although it is
                      // compiled as a scoped slot, render fn users would expect it to be present
                      // on this.$slots because the usage is semantically a normal slot.
                      if (fn.proxy) {
                        Object.defineProperty(normalSlots, key, {
                          get: normalized,
                          enumerable: true,
                          configurable: true
                        });
                      }
                      return normalized
                    }
                  
                    function proxyNormalSlot(slots, key) {
                      return function () { return slots[key]; }
                    }
                  
                    /*  */
                  
                    /**
                     * Runtime helper for rendering v-for lists.
                     */
                    function renderList (
                      val,
                      render
                    ) {
                      var ret, i, l, keys, key;
                      if (Array.isArray(val) || typeof val === 'string') {
                        ret = new Array(val.length);
                        for (i = 0, l = val.length; i < l; i++) {
                          ret[i] = render(val[i], i);
                        }
                      } else if (typeof val === 'number') {
                        ret = new Array(val);
                        for (i = 0; i < val; i++) {
                          ret[i] = render(i + 1, i);
                        }
                      } else if (isObject(val)) {
                        if (hasSymbol && val[Symbol.iterator]) {
                          ret = [];
                          var iterator = val[Symbol.iterator]();
                          var result = iterator.next();
                          while (!result.done) {
                            ret.push(render(result.value, ret.length));
                            result = iterator.next();
                          }
                        } else {
                          keys = Object.keys(val);
                          ret = new Array(keys.length);
                          for (i = 0, l = keys.length; i < l; i++) {
                            key = keys[i];
                            ret[i] = render(val[key], key, i);
                          }
                        }
                      }
                      if (!isDef(ret)) {
                        ret = [];
                      }
                      (ret)._isVList = true;
                      return ret
                    }
                  
                    /*  */
                  
                    /**
                     * Runtime helper for rendering <slot>
                     */
                    function renderSlot (
                      name,
                      fallback,
                      props,
                      bindObject
                    ) {
                      var scopedSlotFn = this.$scopedSlots[name];
                      var nodes;
                      if (scopedSlotFn) { // scoped slot
                        props = props || {};
                        if (bindObject) {
                          if (!isObject(bindObject)) {
                            warn(
                              'slot v-bind without argument expects an Object',
                              this
                            );
                          }
                          props = extend(extend({}, bindObject), props);
                        }
                        nodes = scopedSlotFn(props) || fallback;
                      } else {
                        nodes = this.$slots[name] || fallback;
                      }
                  
                      var target = props && props.slot;
                      if (target) {
                        return this.$createElement('template', { slot: target }, nodes)
                      } else {
                        return nodes
                      }
                    }
                  
                    /*  */
                  
                    /**
                     * Runtime helper for resolving filters
                     */
                    function resolveFilter (id) {
                      return resolveAsset(this.$options, 'filters', id, true) || identity
                    }
                  
                    /*  */
                  
                    function isKeyNotMatch (expect, actual) {
                      if (Array.isArray(expect)) {
                        return expect.indexOf(actual) === -1
                      } else {
                        return expect !== actual
                      }
                    }
                  
                    /**
                     * Runtime helper for checking keyCodes from config.
                     * exposed as Vue.prototype._k
                     * passing in eventKeyName as last argument separately for backwards compat
                     */
                    function checkKeyCodes (
                      eventKeyCode,
                      key,
                      builtInKeyCode,
                      eventKeyName,
                      builtInKeyName
                    ) {
                      var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
                      if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
                        return isKeyNotMatch(builtInKeyName, eventKeyName)
                      } else if (mappedKeyCode) {
                        return isKeyNotMatch(mappedKeyCode, eventKeyCode)
                      } else if (eventKeyName) {
                        return hyphenate(eventKeyName) !== key
                      }
                    }
                  
                    /*  */
                  
                    /**
                     * Runtime helper for merging v-bind="object" into a VNode's data.
                     */
                    function bindObjectProps (
                      data,
                      tag,
                      value,
                      asProp,
                      isSync
                    ) {
                      if (value) {
                        if (!isObject(value)) {
                          warn(
                            'v-bind without argument expects an Object or Array value',
                            this
                          );
                        } else {
                          if (Array.isArray(value)) {
                            value = toObject(value);
                          }
                          var hash;
                          var loop = function ( key ) {
                            if (
                              key === 'class' ||
                              key === 'style' ||
                              isReservedAttribute(key)
                            ) {
                              hash = data;
                            } else {
                              var type = data.attrs && data.attrs.type;
                              hash = asProp || config.mustUseProp(tag, type, key)
                                ? data.domProps || (data.domProps = {})
                                : data.attrs || (data.attrs = {});
                            }
                            var camelizedKey = camelize(key);
                            var hyphenatedKey = hyphenate(key);
                            if (!(camelizedKey in hash) && !(hyphenatedKey in hash)) {
                              hash[key] = value[key];
                  
                              if (isSync) {
                                var on = data.on || (data.on = {});
                                on[("update:" + key)] = function ($event) {
                                  value[key] = $event;
                                };
                              }
                            }
                          };
                  
                          for (var key in value) loop( key );
                        }
                      }
                      return data
                    }
                  
                    /*  */
                  
                    /**
                     * Runtime helper for rendering static trees.
                     */
                    function renderStatic (
                      index,
                      isInFor
                    ) {
                      var cached = this._staticTrees || (this._staticTrees = []);
                      var tree = cached[index];
                      // if has already-rendered static tree and not inside v-for,
                      // we can reuse the same tree.
                      if (tree && !isInFor) {
                        return tree
                      }
                      // otherwise, render a fresh tree.
                      tree = cached[index] = this.$options.staticRenderFns[index].call(
                        this._renderProxy,
                        null,
                        this // for render fns generated for functional component templates
                      );
                      markStatic(tree, ("__static__" + index), false);
                      return tree
                    }
                  
                    /**
                     * Runtime helper for v-once.
                     * Effectively it means marking the node as static with a unique key.
                     */
                    function markOnce (
                      tree,
                      index,
                      key
                    ) {
                      markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
                      return tree
                    }
                  
                    function markStatic (
                      tree,
                      key,
                      isOnce
                    ) {
                      if (Array.isArray(tree)) {
                        for (var i = 0; i < tree.length; i++) {
                          if (tree[i] && typeof tree[i] !== 'string') {
                            markStaticNode(tree[i], (key + "_" + i), isOnce);
                          }
                        }
                      } else {
                        markStaticNode(tree, key, isOnce);
                      }
                    }
                  
                    function markStaticNode (node, key, isOnce) {
                      node.isStatic = true;
                      node.key = key;
                      node.isOnce = isOnce;
                    }
                  
                    /*  */
                  
                    function bindObjectListeners (data, value) {
                      if (value) {
                        if (!isPlainObject(value)) {
                          warn(
                            'v-on without argument expects an Object value',
                            this
                          );
                        } else {
                          var on = data.on = data.on ? extend({}, data.on) : {};
                          for (var key in value) {
                            var existing = on[key];
                            var ours = value[key];
                            on[key] = existing ? [].concat(existing, ours) : ours;
                          }
                        }
                      }
                      return data
                    }
                  
                    /*  */
                  
                    function resolveScopedSlots (
                      fns, // see flow/vnode
                      res,
                      // the following are added in 2.6
                      hasDynamicKeys,
                      contentHashKey
                    ) {
                      res = res || { $stable: !hasDynamicKeys };
                      for (var i = 0; i < fns.length; i++) {
                        var slot = fns[i];
                        if (Array.isArray(slot)) {
                          resolveScopedSlots(slot, res, hasDynamicKeys);
                        } else if (slot) {
                          // marker for reverse proxying v-slot without scope on this.$slots
                          if (slot.proxy) {
                            slot.fn.proxy = true;
                          }
                          res[slot.key] = slot.fn;
                        }
                      }
                      if (contentHashKey) {
                        (res).$key = contentHashKey;
                      }
                      return res
                    }
                  
                    /*  */
                  
                    function bindDynamicKeys (baseObj, values) {
                      for (var i = 0; i < values.length; i += 2) {
                        var key = values[i];
                        if (typeof key === 'string' && key) {
                          baseObj[values[i]] = values[i + 1];
                        } else if (key !== '' && key !== null) {
                          // null is a special value for explicitly removing a binding
                          warn(
                            ("Invalid value for dynamic directive argument (expected string or null): " + key),
                            this
                          );
                        }
                      }
                      return baseObj
                    }
                  
                    // helper to dynamically append modifier runtime markers to event names.
                    // ensure only append when value is already string, otherwise it will be cast
                    // to string and cause the type check to miss.
                    function prependModifier (value, symbol) {
                      return typeof value === 'string' ? symbol + value : value
                    }
                  
                    /*  */
                  
                    function installRenderHelpers (target) {
                      target._o = markOnce;
                      target._n = toNumber;
                      target._s = toString;
                      target._l = renderList;
                      target._t = renderSlot;
                      target._q = looseEqual;
                      target._i = looseIndexOf;
                      target._m = renderStatic;
                      target._f = resolveFilter;
                      target._k = checkKeyCodes;
                      target._b = bindObjectProps;
                      target._v = createTextVNode;
                      target._e = createEmptyVNode;
                      target._u = resolveScopedSlots;
                      target._g = bindObjectListeners;
                      target._d = bindDynamicKeys;
                      target._p = prependModifier;
                    }
                  
                    /*  */
                  
                    function FunctionalRenderContext (
                      data,
                      props,
                      children,
                      parent,
                      Ctor
                    ) {
                      var this$1 = this;
                  
                      var options = Ctor.options;
                      // ensure the createElement function in functional components
                      // gets a unique context - this is necessary for correct named slot check
                      var contextVm;
                      if (hasOwn(parent, '_uid')) {
                        contextVm = Object.create(parent);
                        // $flow-disable-line
                        contextVm._original = parent;
                      } else {
                        // the context vm passed in is a functional context as well.
                        // in this case we want to make sure we are able to get a hold to the
                        // real context instance.
                        contextVm = parent;
                        // $flow-disable-line
                        parent = parent._original;
                      }
                      var isCompiled = isTrue(options._compiled);
                      var needNormalization = !isCompiled;
                  
                      this.data = data;
                      this.props = props;
                      this.children = children;
                      this.parent = parent;
                      this.listeners = data.on || emptyObject;
                      this.injections = resolveInject(options.inject, parent);
                      this.slots = function () {
                        if (!this$1.$slots) {
                          normalizeScopedSlots(
                            data.scopedSlots,
                            this$1.$slots = resolveSlots(children, parent)
                          );
                        }
                        return this$1.$slots
                      };
                  
                      Object.defineProperty(this, 'scopedSlots', ({
                        enumerable: true,
                        get: function get () {
                          return normalizeScopedSlots(data.scopedSlots, this.slots())
                        }
                      }));
                  
                      // support for compiled functional template
                      if (isCompiled) {
                        // exposing $options for renderStatic()
                        this.$options = options;
                        // pre-resolve slots for renderSlot()
                        this.$slots = this.slots();
                        this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
                      }
                  
                      if (options._scopeId) {
                        this._c = function (a, b, c, d) {
                          var vnode = createElement(contextVm, a, b, c, d, needNormalization);
                          if (vnode && !Array.isArray(vnode)) {
                            vnode.fnScopeId = options._scopeId;
                            vnode.fnContext = parent;
                          }
                          return vnode
                        };
                      } else {
                        this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
                      }
                    }
                  
                    installRenderHelpers(FunctionalRenderContext.prototype);
                  
                    function createFunctionalComponent (
                      Ctor,
                      propsData,
                      data,
                      contextVm,
                      children
                    ) {
                      var options = Ctor.options;
                      var props = {};
                      var propOptions = options.props;
                      if (isDef(propOptions)) {
                        for (var key in propOptions) {
                          props[key] = validateProp(key, propOptions, propsData || emptyObject);
                        }
                      } else {
                        if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
                        if (isDef(data.props)) { mergeProps(props, data.props); }
                      }
                  
                      var renderContext = new FunctionalRenderContext(
                        data,
                        props,
                        children,
                        contextVm,
                        Ctor
                      );
                  
                      var vnode = options.render.call(null, renderContext._c, renderContext);
                  
                      if (vnode instanceof VNode) {
                        return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
                      } else if (Array.isArray(vnode)) {
                        var vnodes = normalizeChildren(vnode) || [];
                        var res = new Array(vnodes.length);
                        for (var i = 0; i < vnodes.length; i++) {
                          res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
                        }
                        return res
                      }
                    }
                  
                    function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
                      // #7817 clone node before setting fnContext, otherwise if the node is reused
                      // (e.g. it was from a cached normal slot) the fnContext causes named slots
                      // that should not be matched to match.
                      var clone = cloneVNode(vnode);
                      clone.fnContext = contextVm;
                      clone.fnOptions = options;
                      {
                        (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
                      }
                      if (data.slot) {
                        (clone.data || (clone.data = {})).slot = data.slot;
                      }
                      return clone
                    }
                  
                    function mergeProps (to, from) {
                      for (var key in from) {
                        to[camelize(key)] = from[key];
                      }
                    }
                  
                    /*  */
                  
                    /*  */
                  
                    /*  */
                  
                    /*  */
                  
                    // inline hooks to be invoked on component VNodes during patch
                    var componentVNodeHooks = {
                      init: function init (vnode, hydrating) {
                        if (
                          vnode.componentInstance &&
                          !vnode.componentInstance._isDestroyed &&
                          vnode.data.keepAlive
                        ) {
                          // kept-alive components, treat as a patch
                          var mountedNode = vnode; // work around flow
                          componentVNodeHooks.prepatch(mountedNode, mountedNode);
                        } else {
                          var child = vnode.componentInstance = createComponentInstanceForVnode(
                            vnode,
                            activeInstance
                          );
                          child.$mount(hydrating ? vnode.elm : undefined, hydrating);
                        }
                      },
                  
                      prepatch: function prepatch (oldVnode, vnode) {
                        var options = vnode.componentOptions;
                        var child = vnode.componentInstance = oldVnode.componentInstance;
                        updateChildComponent(
                          child,
                          options.propsData, // updated props
                          options.listeners, // updated listeners
                          vnode, // new parent vnode
                          options.children // new children
                        );
                      },
                  
                      insert: function insert (vnode) {
                        var context = vnode.context;
                        var componentInstance = vnode.componentInstance;
                        if (!componentInstance._isMounted) {
                          componentInstance._isMounted = true;
                          callHook(componentInstance, 'mounted');
                        }
                        if (vnode.data.keepAlive) {
                          if (context._isMounted) {
                            // vue-router#1212
                            // During updates, a kept-alive component's child components may
                            // change, so directly walking the tree here may call activated hooks
                            // on incorrect children. Instead we push them into a queue which will
                            // be processed after the whole patch process ended.
                            queueActivatedComponent(componentInstance);
                          } else {
                            activateChildComponent(componentInstance, true /* direct */);
                          }
                        }
                      },
                  
                      destroy: function destroy (vnode) {
                        var componentInstance = vnode.componentInstance;
                        if (!componentInstance._isDestroyed) {
                          if (!vnode.data.keepAlive) {
                            componentInstance.$destroy();
                          } else {
                            deactivateChildComponent(componentInstance, true /* direct */);
                          }
                        }
                      }
                    };
                  
                    var hooksToMerge = Object.keys(componentVNodeHooks);
                  
                    function createComponent (
                      Ctor,
                      data,
                      context,
                      children,
                      tag
                    ) {
                      if (isUndef(Ctor)) {
                        return
                      }
                  
                      var baseCtor = context.$options._base;
                  
                      // plain options object: turn it into a constructor
                      if (isObject(Ctor)) {
                        Ctor = baseCtor.extend(Ctor);
                      }
                  
                      // if at this stage it's not a constructor or an async component factory,
                      // reject.
                      if (typeof Ctor !== 'function') {
                        {
                          warn(("Invalid Component definition: " + (String(Ctor))), context);
                        }
                        return
                      }
                  
                      // async component
                      var asyncFactory;
                      if (isUndef(Ctor.cid)) {
                        asyncFactory = Ctor;
                        Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
                        if (Ctor === undefined) {
                          // return a placeholder node for async component, which is rendered
                          // as a comment node but preserves all the raw information for the node.
                          // the information will be used for async server-rendering and hydration.
                          return createAsyncPlaceholder(
                            asyncFactory,
                            data,
                            context,
                            children,
                            tag
                          )
                        }
                      }
                  
                      data = data || {};
                  
                      // resolve constructor options in case global mixins are applied after
                      // component constructor creation
                      resolveConstructorOptions(Ctor);
                  
                      // transform component v-model data into props & events
                      if (isDef(data.model)) {
                        transformModel(Ctor.options, data);
                      }
                  
                      // extract props
                      var propsData = extractPropsFromVNodeData(data, Ctor, tag);
                  
                      // functional component
                      if (isTrue(Ctor.options.functional)) {
                        return createFunctionalComponent(Ctor, propsData, data, context, children)
                      }
                  
                      // extract listeners, since these needs to be treated as
                      // child component listeners instead of DOM listeners
                      var listeners = data.on;
                      // replace with listeners with .native modifier
                      // so it gets processed during parent component patch.
                      data.on = data.nativeOn;
                  
                      if (isTrue(Ctor.options.abstract)) {
                        // abstract components do not keep anything
                        // other than props & listeners & slot
                  
                        // work around flow
                        var slot = data.slot;
                        data = {};
                        if (slot) {
                          data.slot = slot;
                        }
                      }
                  
                      // install component management hooks onto the placeholder node
                      installComponentHooks(data);
                  
                      // return a placeholder vnode
                      var name = Ctor.options.name || tag;
                      var vnode = new VNode(
                        ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
                        data, undefined, undefined, undefined, context,
                        { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
                        asyncFactory
                      );
                  
                      return vnode
                    }
                  
                    function createComponentInstanceForVnode (
                      vnode, // we know it's MountedComponentVNode but flow doesn't
                      parent // activeInstance in lifecycle state
                    ) {
                      var options = {
                        _isComponent: true,
                        _parentVnode: vnode,
                        parent: parent
                      };
                      // check inline-template render functions
                      var inlineTemplate = vnode.data.inlineTemplate;
                      if (isDef(inlineTemplate)) {
                        options.render = inlineTemplate.render;
                        options.staticRenderFns = inlineTemplate.staticRenderFns;
                      }
                      return new vnode.componentOptions.Ctor(options)
                    }
                  
                    function installComponentHooks (data) {
                      var hooks = data.hook || (data.hook = {});
                      for (var i = 0; i < hooksToMerge.length; i++) {
                        var key = hooksToMerge[i];
                        var existing = hooks[key];
                        var toMerge = componentVNodeHooks[key];
                        if (existing !== toMerge && !(existing && existing._merged)) {
                          hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
                        }
                      }
                    }
                  
                    function mergeHook$1 (f1, f2) {
                      var merged = function (a, b) {
                        // flow complains about extra args which is why we use any
                        f1(a, b);
                        f2(a, b);
                      };
                      merged._merged = true;
                      return merged
                    }
                  
                    // transform component v-model info (value and callback) into
                    // prop and event handler respectively.
                    function transformModel (options, data) {
                      var prop = (options.model && options.model.prop) || 'value';
                      var event = (options.model && options.model.event) || 'input'
                      ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
                      var on = data.on || (data.on = {});
                      var existing = on[event];
                      var callback = data.model.callback;
                      if (isDef(existing)) {
                        if (
                          Array.isArray(existing)
                            ? existing.indexOf(callback) === -1
                            : existing !== callback
                        ) {
                          on[event] = [callback].concat(existing);
                        }
                      } else {
                        on[event] = callback;
                      }
                    }
                  
                    /*  */
                  
                    var SIMPLE_NORMALIZE = 1;
                    var ALWAYS_NORMALIZE = 2;
                  
                    // wrapper function for providing a more flexible interface
                    // without getting yelled at by flow
                    function createElement (
                      context,
                      tag,
                      data,
                      children,
                      normalizationType,
                      alwaysNormalize
                    ) {
                      if (Array.isArray(data) || isPrimitive(data)) {
                        normalizationType = children;
                        children = data;
                        data = undefined;
                      }
                      if (isTrue(alwaysNormalize)) {
                        normalizationType = ALWAYS_NORMALIZE;
                      }
                      return _createElement(context, tag, data, children, normalizationType)
                    }
                  
                    function _createElement (
                      context,
                      tag,
                      data,
                      children,
                      normalizationType
                    ) {
                      if (isDef(data) && isDef((data).__ob__)) {
                        warn(
                          "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
                          'Always create fresh vnode data objects in each render!',
                          context
                        );
                        return createEmptyVNode()
                      }
                      // object syntax in v-bind
                      if (isDef(data) && isDef(data.is)) {
                        tag = data.is;
                      }
                      if (!tag) {
                        // in case of component :is set to falsy value
                        return createEmptyVNode()
                      }
                      // warn against non-primitive key
                      if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
                      ) {
                        {
                          warn(
                            'Avoid using non-primitive value as key, ' +
                            'use string/number value instead.',
                            context
                          );
                        }
                      }
                      // support single function children as default scoped slot
                      if (Array.isArray(children) &&
                        typeof children[0] === 'function'
                      ) {
                        data = data || {};
                        data.scopedSlots = { default: children[0] };
                        children.length = 0;
                      }
                      if (normalizationType === ALWAYS_NORMALIZE) {
                        children = normalizeChildren(children);
                      } else if (normalizationType === SIMPLE_NORMALIZE) {
                        children = simpleNormalizeChildren(children);
                      }
                      var vnode, ns;
                      if (typeof tag === 'string') {
                        var Ctor;
                        ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
                        if (config.isReservedTag(tag)) {
                          // platform built-in elements
                          if (isDef(data) && isDef(data.nativeOn)) {
                            warn(
                              ("The .native modifier for v-on is only valid on components but it was used on <" + tag + ">."),
                              context
                            );
                          }
                          vnode = new VNode(
                            config.parsePlatformTagName(tag), data, children,
                            undefined, undefined, context
                          );
                        } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
                          // component
                          vnode = createComponent(Ctor, data, context, children, tag);
                        } else {
                          // unknown or unlisted namespaced elements
                          // check at runtime because it may get assigned a namespace when its
                          // parent normalizes children
                          vnode = new VNode(
                            tag, data, children,
                            undefined, undefined, context
                          );
                        }
                      } else {
                        // direct component options / constructor
                        vnode = createComponent(tag, data, context, children);
                      }
                      if (Array.isArray(vnode)) {
                        return vnode
                      } else if (isDef(vnode)) {
                        if (isDef(ns)) { applyNS(vnode, ns); }
                        if (isDef(data)) { registerDeepBindings(data); }
                        return vnode
                      } else {
                        return createEmptyVNode()
                      }
                    }
                  
                    function applyNS (vnode, ns, force) {
                      vnode.ns = ns;
                      if (vnode.tag === 'foreignObject') {
                        // use default namespace inside foreignObject
                        ns = undefined;
                        force = true;
                      }
                      if (isDef(vnode.children)) {
                        for (var i = 0, l = vnode.children.length; i < l; i++) {
                          var child = vnode.children[i];
                          if (isDef(child.tag) && (
                            isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
                            applyNS(child, ns, force);
                          }
                        }
                      }
                    }
                  
                    // ref #5318
                    // necessary to ensure parent re-render when deep bindings like :style and
                    // :class are used on slot nodes
                    function registerDeepBindings (data) {
                      if (isObject(data.style)) {
                        traverse(data.style);
                      }
                      if (isObject(data.class)) {
                        traverse(data.class);
                      }
                    }
                  
                    /*  */
                  
                    function initRender (vm) {
                      vm._vnode = null; // the root of the child tree
                      vm._staticTrees = null; // v-once cached trees
                      var options = vm.$options;
                      var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
                      var renderContext = parentVnode && parentVnode.context;
                      vm.$slots = resolveSlots(options._renderChildren, renderContext);
                      vm.$scopedSlots = emptyObject;
                      // bind the createElement fn to this instance
                      // so that we get proper render context inside it.
                      // args order: tag, data, children, normalizationType, alwaysNormalize
                      // internal version is used by render functions compiled from templates
                      vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
                      // normalization is always applied for the public version, used in
                      // user-written render functions.
                      vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
                  
                      // $attrs & $listeners are exposed for easier HOC creation.
                      // they need to be reactive so that HOCs using them are always updated
                      var parentData = parentVnode && parentVnode.data;
                  
                      /* istanbul ignore else */
                      {
                        defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
                          !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
                        }, true);
                        defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
                          !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
                        }, true);
                      }
                    }
                  
                    var currentRenderingInstance = null;
                  
                    function renderMixin (Vue) {
                      // install runtime convenience helpers
                      installRenderHelpers(Vue.prototype);
                  
                      Vue.prototype.$nextTick = function (fn) {
                        return nextTick(fn, this)
                      };
                  
                      Vue.prototype._render = function () {
                        var vm = this;
                        var ref = vm.$options;
                        var render = ref.render;
                        var _parentVnode = ref._parentVnode;
                  
                        if (_parentVnode) {
                          vm.$scopedSlots = normalizeScopedSlots(
                            _parentVnode.data.scopedSlots,
                            vm.$slots,
                            vm.$scopedSlots
                          );
                        }
                  
                        // set parent vnode. this allows render functions to have access
                        // to the data on the placeholder node.
                        vm.$vnode = _parentVnode;
                        // render self
                        var vnode;
                        try {
                          // There's no need to maintain a stack because all render fns are called
                          // separately from one another. Nested component's render fns are called
                          // when parent component is patched.
                          currentRenderingInstance = vm;
                          vnode = render.call(vm._renderProxy, vm.$createElement);
                        } catch (e) {
                          handleError(e, vm, "render");
                          // return error render result,
                          // or previous vnode to prevent render error causing blank component
                          /* istanbul ignore else */
                          if (vm.$options.renderError) {
                            try {
                              vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
                            } catch (e) {
                              handleError(e, vm, "renderError");
                              vnode = vm._vnode;
                            }
                          } else {
                            vnode = vm._vnode;
                          }
                        } finally {
                          currentRenderingInstance = null;
                        }
                        // if the returned array contains only a single node, allow it
                        if (Array.isArray(vnode) && vnode.length === 1) {
                          vnode = vnode[0];
                        }
                        // return empty vnode in case the render function errored out
                        if (!(vnode instanceof VNode)) {
                          if (Array.isArray(vnode)) {
                            warn(
                              'Multiple root nodes returned from render function. Render function ' +
                              'should return a single root node.',
                              vm
                            );
                          }
                          vnode = createEmptyVNode();
                        }
                        // set parent
                        vnode.parent = _parentVnode;
                        return vnode
                      };
                    }
                  
                    /*  */
                  
                    function ensureCtor (comp, base) {
                      if (
                        comp.__esModule ||
                        (hasSymbol && comp[Symbol.toStringTag] === 'Module')
                      ) {
                        comp = comp.default;
                      }
                      return isObject(comp)
                        ? base.extend(comp)
                        : comp
                    }
                  
                    function createAsyncPlaceholder (
                      factory,
                      data,
                      context,
                      children,
                      tag
                    ) {
                      var node = createEmptyVNode();
                      node.asyncFactory = factory;
                      node.asyncMeta = { data: data, context: context, children: children, tag: tag };
                      return node
                    }
                  
                    function resolveAsyncComponent (
                      factory,
                      baseCtor
                    ) {
                      if (isTrue(factory.error) && isDef(factory.errorComp)) {
                        return factory.errorComp
                      }
                  
                      if (isDef(factory.resolved)) {
                        return factory.resolved
                      }
                  
                      var owner = currentRenderingInstance;
                      if (owner && isDef(factory.owners) && factory.owners.indexOf(owner) === -1) {
                        // already pending
                        factory.owners.push(owner);
                      }
                  
                      if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
                        return factory.loadingComp
                      }
                  
                      if (owner && !isDef(factory.owners)) {
                        var owners = factory.owners = [owner];
                        var sync = true;
                        var timerLoading = null;
                        var timerTimeout = null
                  
                        ;(owner).$on('hook:destroyed', function () { return remove(owners, owner); });
                  
                        var forceRender = function (renderCompleted) {
                          for (var i = 0, l = owners.length; i < l; i++) {
                            (owners[i]).$forceUpdate();
                          }
                  
                          if (renderCompleted) {
                            owners.length = 0;
                            if (timerLoading !== null) {
                              clearTimeout(timerLoading);
                              timerLoading = null;
                            }
                            if (timerTimeout !== null) {
                              clearTimeout(timerTimeout);
                              timerTimeout = null;
                            }
                          }
                        };
                  
                        var resolve = once(function (res) {
                          // cache resolved
                          factory.resolved = ensureCtor(res, baseCtor);
                          // invoke callbacks only if this is not a synchronous resolve
                          // (async resolves are shimmed as synchronous during SSR)
                          if (!sync) {
                            forceRender(true);
                          } else {
                            owners.length = 0;
                          }
                        });
                  
                        var reject = once(function (reason) {
                          warn(
                            "Failed to resolve async component: " + (String(factory)) +
                            (reason ? ("\nReason: " + reason) : '')
                          );
                          if (isDef(factory.errorComp)) {
                            factory.error = true;
                            forceRender(true);
                          }
                        });
                  
                        var res = factory(resolve, reject);
                  
                        if (isObject(res)) {
                          if (isPromise(res)) {
                            // () => Promise
                            if (isUndef(factory.resolved)) {
                              res.then(resolve, reject);
                            }
                          } else if (isPromise(res.component)) {
                            res.component.then(resolve, reject);
                  
                            if (isDef(res.error)) {
                              factory.errorComp = ensureCtor(res.error, baseCtor);
                            }
                  
                            if (isDef(res.loading)) {
                              factory.loadingComp = ensureCtor(res.loading, baseCtor);
                              if (res.delay === 0) {
                                factory.loading = true;
                              } else {
                                timerLoading = setTimeout(function () {
                                  timerLoading = null;
                                  if (isUndef(factory.resolved) && isUndef(factory.error)) {
                                    factory.loading = true;
                                    forceRender(false);
                                  }
                                }, res.delay || 200);
                              }
                            }
                  
                            if (isDef(res.timeout)) {
                              timerTimeout = setTimeout(function () {
                                timerTimeout = null;
                                if (isUndef(factory.resolved)) {
                                  reject(
                                    "timeout (" + (res.timeout) + "ms)"
                                  );
                                }
                              }, res.timeout);
                            }
                          }
                        }
                  
                        sync = false;
                        // return in case resolved synchronously
                        return factory.loading
                          ? factory.loadingComp
                          : factory.resolved
                      }
                    }
                  
                    /*  */
                  
                    function isAsyncPlaceholder (node) {
                      return node.isComment && node.asyncFactory
                    }
                  
                    /*  */
                  
                    function getFirstComponentChild (children) {
                      if (Array.isArray(children)) {
                        for (var i = 0; i < children.length; i++) {
                          var c = children[i];
                          if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
                            return c
                          }
                        }
                      }
                    }
                  
                    /*  */
                  
                    /*  */
                  
                    function initEvents (vm) {
                      vm._events = Object.create(null);
                      vm._hasHookEvent = false;
                      // init parent attached events
                      var listeners = vm.$options._parentListeners;
                      if (listeners) {
                        updateComponentListeners(vm, listeners);
                      }
                    }
                  
                    var target;
                  
                    function add (event, fn) {
                      target.$on(event, fn);
                    }
                  
                    function remove$1 (event, fn) {
                      target.$off(event, fn);
                    }
                  
                    function createOnceHandler (event, fn) {
                      var _target = target;
                      return function onceHandler () {
                        var res = fn.apply(null, arguments);
                        if (res !== null) {
                          _target.$off(event, onceHandler);
                        }
                      }
                    }
                  
                    function updateComponentListeners (
                      vm,
                      listeners,
                      oldListeners
                    ) {
                      target = vm;
                      updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
                      target = undefined;
                    }
                  
                    function eventsMixin (Vue) {
                      var hookRE = /^hook:/;
                      Vue.prototype.$on = function (event, fn) {
                        var vm = this;
                        if (Array.isArray(event)) {
                          for (var i = 0, l = event.length; i < l; i++) {
                            vm.$on(event[i], fn);
                          }
                        } else {
                          (vm._events[event] || (vm._events[event] = [])).push(fn);
                          // optimize hook:event cost by using a boolean flag marked at registration
                          // instead of a hash lookup
                          if (hookRE.test(event)) {
                            vm._hasHookEvent = true;
                          }
                        }
                        return vm
                      };
                  
                      Vue.prototype.$once = function (event, fn) {
                        var vm = this;
                        function on () {
                          vm.$off(event, on);
                          fn.apply(vm, arguments);
                        }
                        on.fn = fn;
                        vm.$on(event, on);
                        return vm
                      };
                  
                      Vue.prototype.$off = function (event, fn) {
                        var vm = this;
                        // all
                        if (!arguments.length) {
                          vm._events = Object.create(null);
                          return vm
                        }
                        // array of events
                        if (Array.isArray(event)) {
                          for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
                            vm.$off(event[i$1], fn);
                          }
                          return vm
                        }
                        // specific event
                        var cbs = vm._events[event];
                        if (!cbs) {
                          return vm
                        }
                        if (!fn) {
                          vm._events[event] = null;
                          return vm
                        }
                        // specific handler
                        var cb;
                        var i = cbs.length;
                        while (i--) {
                          cb = cbs[i];
                          if (cb === fn || cb.fn === fn) {
                            cbs.splice(i, 1);
                            break
                          }
                        }
                        return vm
                      };
                  
                      Vue.prototype.$emit = function (event) {
                        var vm = this;
                        {
                          var lowerCaseEvent = event.toLowerCase();
                          if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                            tip(
                              "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                              (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                              "Note that HTML attributes are case-insensitive and you cannot use " +
                              "v-on to listen to camelCase events when using in-DOM templates. " +
                              "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
                            );
                          }
                        }
                        var cbs = vm._events[event];
                        if (cbs) {
                          cbs = cbs.length > 1 ? toArray(cbs) : cbs;
                          var args = toArray(arguments, 1);
                          var info = "event handler for \"" + event + "\"";
                          for (var i = 0, l = cbs.length; i < l; i++) {
                            invokeWithErrorHandling(cbs[i], vm, args, vm, info);
                          }
                        }
                        return vm
                      };
                    }
                  
                    /*  */
                  
                    var activeInstance = null;
                    var isUpdatingChildComponent = false;
                  
                    function setActiveInstance(vm) {
                      var prevActiveInstance = activeInstance;
                      activeInstance = vm;
                      return function () {
                        activeInstance = prevActiveInstance;
                      }
                    }
                  
                    function initLifecycle (vm) {
                      var options = vm.$options;
                  
                      // locate first non-abstract parent
                      var parent = options.parent;
                      if (parent && !options.abstract) {
                        while (parent.$options.abstract && parent.$parent) {
                          parent = parent.$parent;
                        }
                        parent.$children.push(vm);
                      }
                  
                      vm.$parent = parent;
                      vm.$root = parent ? parent.$root : vm;
                  
                      vm.$children = [];
                      vm.$refs = {};
                  
                      vm._watcher = null;
                      vm._inactive = null;
                      vm._directInactive = false;
                      vm._isMounted = false;
                      vm._isDestroyed = false;
                      vm._isBeingDestroyed = false;
                    }
                  
                    function lifecycleMixin (Vue) {
                      Vue.prototype._update = function (vnode, hydrating) {
                        var vm = this;
                        var prevEl = vm.$el;
                        var prevVnode = vm._vnode;
                        var restoreActiveInstance = setActiveInstance(vm);
                        vm._vnode = vnode;
                        // Vue.prototype.__patch__ is injected in entry points
                        // based on the rendering backend used.
                        if (!prevVnode) {
                          // initial render
                          vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
                        } else {
                          // updates
                          vm.$el = vm.__patch__(prevVnode, vnode);
                        }
                        restoreActiveInstance();
                        // update __vue__ reference
                        if (prevEl) {
                          prevEl.__vue__ = null;
                        }
                        if (vm.$el) {
                          vm.$el.__vue__ = vm;
                        }
                        // if parent is an HOC, update its $el as well
                        if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
                          vm.$parent.$el = vm.$el;
                        }
                        // updated hook is called by the scheduler to ensure that children are
                        // updated in a parent's updated hook.
                      };
                  
                      Vue.prototype.$forceUpdate = function () {
                        var vm = this;
                        if (vm._watcher) {
                          vm._watcher.update();
                        }
                      };
                  
                      Vue.prototype.$destroy = function () {
                        var vm = this;
                        if (vm._isBeingDestroyed) {
                          return
                        }
                        callHook(vm, 'beforeDestroy');
                        vm._isBeingDestroyed = true;
                        // remove self from parent
                        var parent = vm.$parent;
                        if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
                          remove(parent.$children, vm);
                        }
                        // teardown watchers
                        if (vm._watcher) {
                          vm._watcher.teardown();
                        }
                        var i = vm._watchers.length;
                        while (i--) {
                          vm._watchers[i].teardown();
                        }
                        // remove reference from data ob
                        // frozen object may not have observer.
                        if (vm._data.__ob__) {
                          vm._data.__ob__.vmCount--;
                        }
                        // call the last hook...
                        vm._isDestroyed = true;
                        // invoke destroy hooks on current rendered tree
                        vm.__patch__(vm._vnode, null);
                        // fire destroyed hook
                        callHook(vm, 'destroyed');
                        // turn off all instance listeners.
                        vm.$off();
                        // remove __vue__ reference
                        if (vm.$el) {
                          vm.$el.__vue__ = null;
                        }
                        // release circular reference (#6759)
                        if (vm.$vnode) {
                          vm.$vnode.parent = null;
                        }
                      };
                    }
                  
                    function mountComponent (
                      vm,
                      el,
                      hydrating
                    ) {
                      vm.$el = el;
                      if (!vm.$options.render) {
                        vm.$options.render = createEmptyVNode;
                        {
                          /* istanbul ignore if */
                          if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                            vm.$options.el || el) {
                            warn(
                              'You are using the runtime-only build of Vue where the template ' +
                              'compiler is not available. Either pre-compile the templates into ' +
                              'render functions, or use the compiler-included build.',
                              vm
                            );
                          } else {
                            warn(
                              'Failed to mount component: template or render function not defined.',
                              vm
                            );
                          }
                        }
                      }
                      callHook(vm, 'beforeMount');
                  
                      var updateComponent;
                      /* istanbul ignore if */
                      if (config.performance && mark) {
                        updateComponent = function () {
                          var name = vm._name;
                          var id = vm._uid;
                          var startTag = "vue-perf-start:" + id;
                          var endTag = "vue-perf-end:" + id;
                  
                          mark(startTag);
                          var vnode = vm._render();
                          mark(endTag);
                          measure(("vue " + name + " render"), startTag, endTag);
                  
                          mark(startTag);
                          vm._update(vnode, hydrating);
                          mark(endTag);
                          measure(("vue " + name + " patch"), startTag, endTag);
                        };
                      } else {
                        updateComponent = function () {
                          vm._update(vm._render(), hydrating);
                        };
                      }
                  
                      // we set this to vm._watcher inside the watcher's constructor
                      // since the watcher's initial patch may call $forceUpdate (e.g. inside child
                      // component's mounted hook), which relies on vm._watcher being already defined
                      new Watcher(vm, updateComponent, noop, {
                        before: function before () {
                          if (vm._isMounted && !vm._isDestroyed) {
                            callHook(vm, 'beforeUpdate');
                          }
                        }
                      }, true /* isRenderWatcher */);
                      hydrating = false;
                  
                      // manually mounted instance, call mounted on self
                      // mounted is called for render-created child components in its inserted hook
                      if (vm.$vnode == null) {
                        vm._isMounted = true;
                        callHook(vm, 'mounted');
                      }
                      return vm
                    }
                  
                    function updateChildComponent (
                      vm,
                      propsData,
                      listeners,
                      parentVnode,
                      renderChildren
                    ) {
                      {
                        isUpdatingChildComponent = true;
                      }
                  
                      // determine whether component has slot children
                      // we need to do this before overwriting $options._renderChildren.
                  
                      // check if there are dynamic scopedSlots (hand-written or compiled but with
                      // dynamic slot names). Static scoped slots compiled from template has the
                      // "$stable" marker.
                      var newScopedSlots = parentVnode.data.scopedSlots;
                      var oldScopedSlots = vm.$scopedSlots;
                      var hasDynamicScopedSlot = !!(
                        (newScopedSlots && !newScopedSlots.$stable) ||
                        (oldScopedSlots !== emptyObject && !oldScopedSlots.$stable) ||
                        (newScopedSlots && vm.$scopedSlots.$key !== newScopedSlots.$key)
                      );
                  
                      // Any static slot children from the parent may have changed during parent's
                      // update. Dynamic scoped slots may also have changed. In such cases, a forced
                      // update is necessary to ensure correctness.
                      var needsForceUpdate = !!(
                        renderChildren ||               // has new static slots
                        vm.$options._renderChildren ||  // has old static slots
                        hasDynamicScopedSlot
                      );
                  
                      vm.$options._parentVnode = parentVnode;
                      vm.$vnode = parentVnode; // update vm's placeholder node without re-render
                  
                      if (vm._vnode) { // update child tree's parent
                        vm._vnode.parent = parentVnode;
                      }
                      vm.$options._renderChildren = renderChildren;
                  
                      // update $attrs and $listeners hash
                      // these are also reactive so they may trigger child update if the child
                      // used them during render
                      vm.$attrs = parentVnode.data.attrs || emptyObject;
                      vm.$listeners = listeners || emptyObject;
                  
                      // update props
                      if (propsData && vm.$options.props) {
                        toggleObserving(false);
                        var props = vm._props;
                        var propKeys = vm.$options._propKeys || [];
                        for (var i = 0; i < propKeys.length; i++) {
                          var key = propKeys[i];
                          var propOptions = vm.$options.props; // wtf flow?
                          props[key] = validateProp(key, propOptions, propsData, vm);
                        }
                        toggleObserving(true);
                        // keep a copy of raw propsData
                        vm.$options.propsData = propsData;
                      }
                  
                      // update listeners
                      listeners = listeners || emptyObject;
                      var oldListeners = vm.$options._parentListeners;
                      vm.$options._parentListeners = listeners;
                      updateComponentListeners(vm, listeners, oldListeners);
                  
                      // resolve slots + force update if has children
                      if (needsForceUpdate) {
                        vm.$slots = resolveSlots(renderChildren, parentVnode.context);
                        vm.$forceUpdate();
                      }
                  
                      {
                        isUpdatingChildComponent = false;
                      }
                    }
                  
                    function isInInactiveTree (vm) {
                      while (vm && (vm = vm.$parent)) {
                        if (vm._inactive) { return true }
                      }
                      return false
                    }
                  
                    function activateChildComponent (vm, direct) {
                      if (direct) {
                        vm._directInactive = false;
                        if (isInInactiveTree(vm)) {
                          return
                        }
                      } else if (vm._directInactive) {
                        return
                      }
                      if (vm._inactive || vm._inactive === null) {
                        vm._inactive = false;
                        for (var i = 0; i < vm.$children.length; i++) {
                          activateChildComponent(vm.$children[i]);
                        }
                        callHook(vm, 'activated');
                      }
                    }
                  
                    function deactivateChildComponent (vm, direct) {
                      if (direct) {
                        vm._directInactive = true;
                        if (isInInactiveTree(vm)) {
                          return
                        }
                      }
                      if (!vm._inactive) {
                        vm._inactive = true;
                        for (var i = 0; i < vm.$children.length; i++) {
                          deactivateChildComponent(vm.$children[i]);
                        }
                        callHook(vm, 'deactivated');
                      }
                    }
                  
                    function callHook (vm, hook) {
                      // #7573 disable dep collection when invoking lifecycle hooks
                      pushTarget();
                      var handlers = vm.$options[hook];
                      var info = hook + " hook";
                      if (handlers) {
                        for (var i = 0, j = handlers.length; i < j; i++) {
                          invokeWithErrorHandling(handlers[i], vm, null, vm, info);
                        }
                      }
                      if (vm._hasHookEvent) {
                        vm.$emit('hook:' + hook);
                      }
                      popTarget();
                    }
                  
                    /*  */
                  
                    var MAX_UPDATE_COUNT = 100;
                  
                    var queue = [];
                    var activatedChildren = [];
                    var has = {};
                    var circular = {};
                    var waiting = false;
                    var flushing = false;
                    var index = 0;
                  
                    /**
                     * Reset the scheduler's state.
                     */
                    function resetSchedulerState () {
                      index = queue.length = activatedChildren.length = 0;
                      has = {};
                      {
                        circular = {};
                      }
                      waiting = flushing = false;
                    }
                  
                    // Async edge case #6566 requires saving the timestamp when event listeners are
                    // attached. However, calling performance.now() has a perf overhead especially
                    // if the page has thousands of event listeners. Instead, we take a timestamp
                    // every time the scheduler flushes and use that for all event listeners
                    // attached during that flush.
                    var currentFlushTimestamp = 0;
                  
                    // Async edge case fix requires storing an event listener's attach timestamp.
                    var getNow = Date.now;
                  
                    // Determine what event timestamp the browser is using. Annoyingly, the
                    // timestamp can either be hi-res (relative to page load) or low-res
                    // (relative to UNIX epoch), so in order to compare time we have to use the
                    // same timestamp type when saving the flush timestamp.
                    // All IE versions use low-res event timestamps, and have problematic clock
                    // implementations (#9632)
                    if (inBrowser && !isIE) {
                      var performance = window.performance;
                      if (
                        performance &&
                        typeof performance.now === 'function' &&
                        getNow() > document.createEvent('Event').timeStamp
                      ) {
                        // if the event timestamp, although evaluated AFTER the Date.now(), is
                        // smaller than it, it means the event is using a hi-res timestamp,
                        // and we need to use the hi-res version for event listener timestamps as
                        // well.
                        getNow = function () { return performance.now(); };
                      }
                    }
                  
                    /**
                     * Flush both queues and run the watchers.
                     */
                    function flushSchedulerQueue () {
                      currentFlushTimestamp = getNow();
                      flushing = true;
                      var watcher, id;
                  
                      // Sort queue before flush.
                      // This ensures that:
                      // 1. Components are updated from parent to child. (because parent is always
                      //    created before the child)
                      // 2. A component's user watchers are run before its render watcher (because
                      //    user watchers are created before the render watcher)
                      // 3. If a component is destroyed during a parent component's watcher run,
                      //    its watchers can be skipped.
                      queue.sort(function (a, b) { return a.id - b.id; });
                  
                      // do not cache length because more watchers might be pushed
                      // as we run existing watchers
                      for (index = 0; index < queue.length; index++) {
                        watcher = queue[index];
                        if (watcher.before) {
                          watcher.before();
                        }
                        id = watcher.id;
                        has[id] = null;
                        watcher.run();
                        // in dev build, check and stop circular updates.
                        if (has[id] != null) {
                          circular[id] = (circular[id] || 0) + 1;
                          if (circular[id] > MAX_UPDATE_COUNT) {
                            warn(
                              'You may have an infinite update loop ' + (
                                watcher.user
                                  ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                                  : "in a component render function."
                              ),
                              watcher.vm
                            );
                            break
                          }
                        }
                      }
                  
                      // keep copies of post queues before resetting state
                      var activatedQueue = activatedChildren.slice();
                      var updatedQueue = queue.slice();
                  
                      resetSchedulerState();
                  
                      // call component updated and activated hooks
                      callActivatedHooks(activatedQueue);
                      callUpdatedHooks(updatedQueue);
                  
                      // devtool hook
                      /* istanbul ignore if */
                      if (devtools && config.devtools) {
                        devtools.emit('flush');
                      }
                    }
                  
                    function callUpdatedHooks (queue) {
                      var i = queue.length;
                      while (i--) {
                        var watcher = queue[i];
                        var vm = watcher.vm;
                        if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
                          callHook(vm, 'updated');
                        }
                      }
                    }
                  
                    /**
                     * Queue a kept-alive component that was activated during patch.
                     * The queue will be processed after the entire tree has been patched.
                     */
                    function queueActivatedComponent (vm) {
                      // setting _inactive to false here so that a render function can
                      // rely on checking whether it's in an inactive tree (e.g. router-view)
                      vm._inactive = false;
                      activatedChildren.push(vm);
                    }
                  
                    function callActivatedHooks (queue) {
                      for (var i = 0; i < queue.length; i++) {
                        queue[i]._inactive = true;
                        activateChildComponent(queue[i], true /* true */);
                      }
                    }
                  
                    /**
                     * Push a watcher into the watcher queue.
                     * Jobs with duplicate IDs will be skipped unless it's
                     * pushed when the queue is being flushed.
                     */
                    function queueWatcher (watcher) {
                      var id = watcher.id;
                      if (has[id] == null) {
                        has[id] = true;
                        if (!flushing) {
                          queue.push(watcher);
                        } else {
                          // if already flushing, splice the watcher based on its id
                          // if already past its id, it will be run next immediately.
                          var i = queue.length - 1;
                          while (i > index && queue[i].id > watcher.id) {
                            i--;
                          }
                          queue.splice(i + 1, 0, watcher);
                        }
                        // queue the flush
                        if (!waiting) {
                          waiting = true;
                  
                          if (!config.async) {
                            flushSchedulerQueue();
                            return
                          }
                          nextTick(flushSchedulerQueue);
                        }
                      }
                    }
                  
                    /*  */
                  
                  
                  
                    var uid$2 = 0;
                  
                    /**
                     * A watcher parses an expression, collects dependencies,
                     * and fires callback when the expression value changes.
                     * This is used for both the $watch() api and directives.
                     */
                    var Watcher = function Watcher (
                      vm,
                      expOrFn,
                      cb,
                      options,
                      isRenderWatcher
                    ) {
                      this.vm = vm;
                      if (isRenderWatcher) {
                        vm._watcher = this;
                      }
                      vm._watchers.push(this);
                      // options
                      if (options) {
                        this.deep = !!options.deep;
                        this.user = !!options.user;
                        this.lazy = !!options.lazy;
                        this.sync = !!options.sync;
                        this.before = options.before;
                      } else {
                        this.deep = this.user = this.lazy = this.sync = false;
                      }
                      this.cb = cb;
                      this.id = ++uid$2; // uid for batching
                      this.active = true;
                      this.dirty = this.lazy; // for lazy watchers
                      this.deps = [];
                      this.newDeps = [];
                      this.depIds = new _Set();
                      this.newDepIds = new _Set();
                      this.expression = expOrFn.toString();
                      // parse expression for getter
                      if (typeof expOrFn === 'function') {
                        this.getter = expOrFn;
                      } else {
                        this.getter = parsePath(expOrFn);
                        if (!this.getter) {
                          this.getter = noop;
                          warn(
                            "Failed watching path: \"" + expOrFn + "\" " +
                            'Watcher only accepts simple dot-delimited paths. ' +
                            'For full control, use a function instead.',
                            vm
                          );
                        }
                      }
                      this.value = this.lazy
                        ? undefined
                        : this.get();
                    };
                  
                    /**
                     * Evaluate the getter, and re-collect dependencies.
                     */
                    Watcher.prototype.get = function get () {
                      pushTarget(this);
                      var value;
                      var vm = this.vm;
                      try {
                        value = this.getter.call(vm, vm);
                      } catch (e) {
                        if (this.user) {
                          handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
                        } else {
                          throw e
                        }
                      } finally {
                        // "touch" every property so they are all tracked as
                        // dependencies for deep watching
                        if (this.deep) {
                          traverse(value);
                        }
                        popTarget();
                        this.cleanupDeps();
                      }
                      return value
                    };
                  
                    /**
                     * Add a dependency to this directive.
                     */
                    Watcher.prototype.addDep = function addDep (dep) {
                      var id = dep.id;
                      if (!this.newDepIds.has(id)) {
                        this.newDepIds.add(id);
                        this.newDeps.push(dep);
                        if (!this.depIds.has(id)) {
                          dep.addSub(this);
                        }
                      }
                    };
                  
                    /**
                     * Clean up for dependency collection.
                     */
                    Watcher.prototype.cleanupDeps = function cleanupDeps () {
                      var i = this.deps.length;
                      while (i--) {
                        var dep = this.deps[i];
                        if (!this.newDepIds.has(dep.id)) {
                          dep.removeSub(this);
                        }
                      }
                      var tmp = this.depIds;
                      this.depIds = this.newDepIds;
                      this.newDepIds = tmp;
                      this.newDepIds.clear();
                      tmp = this.deps;
                      this.deps = this.newDeps;
                      this.newDeps = tmp;
                      this.newDeps.length = 0;
                    };
                  
                    /**
                     * Subscriber interface.
                     * Will be called when a dependency changes.
                     */
                    Watcher.prototype.update = function update () {
                      /* istanbul ignore else */
                      if (this.lazy) {
                        this.dirty = true;
                      } else if (this.sync) {
                        this.run();
                      } else {
                        queueWatcher(this);
                      }
                    };
                  
                    /**
                     * Scheduler job interface.
                     * Will be called by the scheduler.
                     */
                    Watcher.prototype.run = function run () {
                      if (this.active) {
                        var value = this.get();
                        if (
                          value !== this.value ||
                          // Deep watchers and watchers on Object/Arrays should fire even
                          // when the value is the same, because the value may
                          // have mutated.
                          isObject(value) ||
                          this.deep
                        ) {
                          // set new value
                          var oldValue = this.value;
                          this.value = value;
                          if (this.user) {
                            try {
                              this.cb.call(this.vm, value, oldValue);
                            } catch (e) {
                              handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
                            }
                          } else {
                            this.cb.call(this.vm, value, oldValue);
                          }
                        }
                      }
                    };
                  
                    /**
                     * Evaluate the value of the watcher.
                     * This only gets called for lazy watchers.
                     */
                    Watcher.prototype.evaluate = function evaluate () {
                      this.value = this.get();
                      this.dirty = false;
                    };
                  
                    /**
                     * Depend on all deps collected by this watcher.
                     */
                    Watcher.prototype.depend = function depend () {
                      var i = this.deps.length;
                      while (i--) {
                        this.deps[i].depend();
                      }
                    };
                  
                    /**
                     * Remove self from all dependencies' subscriber list.
                     */
                    Watcher.prototype.teardown = function teardown () {
                      if (this.active) {
                        // remove self from vm's watcher list
                        // this is a somewhat expensive operation so we skip it
                        // if the vm is being destroyed.
                        if (!this.vm._isBeingDestroyed) {
                          remove(this.vm._watchers, this);
                        }
                        var i = this.deps.length;
                        while (i--) {
                          this.deps[i].removeSub(this);
                        }
                        this.active = false;
                      }
                    };
                  
                    /*  */
                  
                    var sharedPropertyDefinition = {
                      enumerable: true,
                      configurable: true,
                      get: noop,
                      set: noop
                    };
                  
                    function proxy (target, sourceKey, key) {
                      sharedPropertyDefinition.get = function proxyGetter () {
                        return this[sourceKey][key]
                      };
                      sharedPropertyDefinition.set = function proxySetter (val) {
                        this[sourceKey][key] = val;
                      };
                      Object.defineProperty(target, key, sharedPropertyDefinition);
                    }
                  
                    function initState (vm) {
                      vm._watchers = [];
                      var opts = vm.$options;
                      if (opts.props) { initProps(vm, opts.props); }
                      if (opts.methods) { initMethods(vm, opts.methods); }
                      if (opts.data) {
                        initData(vm);
                      } else {
                        observe(vm._data = {}, true /* asRootData */);
                      }
                      if (opts.computed) { initComputed(vm, opts.computed); }
                      if (opts.watch && opts.watch !== nativeWatch) {
                        initWatch(vm, opts.watch);
                      }
                    }
                  
                    function initProps (vm, propsOptions) {
                      var propsData = vm.$options.propsData || {};
                      var props = vm._props = {};
                      // cache prop keys so that future props updates can iterate using Array
                      // instead of dynamic object key enumeration.
                      var keys = vm.$options._propKeys = [];
                      var isRoot = !vm.$parent;
                      // root instance props should be converted
                      if (!isRoot) {
                        toggleObserving(false);
                      }
                      var loop = function ( key ) {
                        keys.push(key);
                        var value = validateProp(key, propsOptions, propsData, vm);
                        /* istanbul ignore else */
                        {
                          var hyphenatedKey = hyphenate(key);
                          if (isReservedAttribute(hyphenatedKey) ||
                              config.isReservedAttr(hyphenatedKey)) {
                            warn(
                              ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
                              vm
                            );
                          }
                          defineReactive$$1(props, key, value, function () {
                            if (!isRoot && !isUpdatingChildComponent) {
                              warn(
                                "Avoid mutating a prop directly since the value will be " +
                                "overwritten whenever the parent component re-renders. " +
                                "Instead, use a data or computed property based on the prop's " +
                                "value. Prop being mutated: \"" + key + "\"",
                                vm
                              );
                            }
                          });
                        }
                        // static props are already proxied on the component's prototype
                        // during Vue.extend(). We only need to proxy props defined at
                        // instantiation here.
                        if (!(key in vm)) {
                          proxy(vm, "_props", key);
                        }
                      };
                  
                      for (var key in propsOptions) loop( key );
                      toggleObserving(true);
                    }
                  
                    function initData (vm) {
                      var data = vm.$options.data;
                      data = vm._data = typeof data === 'function'
                        ? getData(data, vm)
                        : data || {};
                      if (!isPlainObject(data)) {
                        data = {};
                        warn(
                          'data functions should return an object:\n' +
                          'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
                          vm
                        );
                      }
                      // proxy data on instance
                      var keys = Object.keys(data);
                      var props = vm.$options.props;
                      var methods = vm.$options.methods;
                      var i = keys.length;
                      while (i--) {
                        var key = keys[i];
                        {
                          if (methods && hasOwn(methods, key)) {
                            warn(
                              ("Method \"" + key + "\" has already been defined as a data property."),
                              vm
                            );
                          }
                        }
                        if (props && hasOwn(props, key)) {
                          warn(
                            "The data property \"" + key + "\" is already declared as a prop. " +
                            "Use prop default value instead.",
                            vm
                          );
                        } else if (!isReserved(key)) {
                          proxy(vm, "_data", key);
                        }
                      }
                      // observe data
                      observe(data, true /* asRootData */);
                    }
                  
                    function getData (data, vm) {
                      // #7573 disable dep collection when invoking data getters
                      pushTarget();
                      try {
                        return data.call(vm, vm)
                      } catch (e) {
                        handleError(e, vm, "data()");
                        return {}
                      } finally {
                        popTarget();
                      }
                    }
                  
                    var computedWatcherOptions = { lazy: true };
                  
                    function initComputed (vm, computed) {
                      // $flow-disable-line
                      var watchers = vm._computedWatchers = Object.create(null);
                      // computed properties are just getters during SSR
                      var isSSR = isServerRendering();
                  
                      for (var key in computed) {
                        var userDef = computed[key];
                        var getter = typeof userDef === 'function' ? userDef : userDef.get;
                        if (getter == null) {
                          warn(
                            ("Getter is missing for computed property \"" + key + "\"."),
                            vm
                          );
                        }
                  
                        if (!isSSR) {
                          // create internal watcher for the computed property.
                          watchers[key] = new Watcher(
                            vm,
                            getter || noop,
                            noop,
                            computedWatcherOptions
                          );
                        }
                  
                        // component-defined computed properties are already defined on the
                        // component prototype. We only need to define computed properties defined
                        // at instantiation here.
                        if (!(key in vm)) {
                          defineComputed(vm, key, userDef);
                        } else {
                          if (key in vm.$data) {
                            warn(("The computed property \"" + key + "\" is already defined in data."), vm);
                          } else if (vm.$options.props && key in vm.$options.props) {
                            warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
                          }
                        }
                      }
                    }
                  
                    function defineComputed (
                      target,
                      key,
                      userDef
                    ) {
                      var shouldCache = !isServerRendering();
                      if (typeof userDef === 'function') {
                        sharedPropertyDefinition.get = shouldCache
                          ? createComputedGetter(key)
                          : createGetterInvoker(userDef);
                        sharedPropertyDefinition.set = noop;
                      } else {
                        sharedPropertyDefinition.get = userDef.get
                          ? shouldCache && userDef.cache !== false
                            ? createComputedGetter(key)
                            : createGetterInvoker(userDef.get)
                          : noop;
                        sharedPropertyDefinition.set = userDef.set || noop;
                      }
                      if (sharedPropertyDefinition.set === noop) {
                        sharedPropertyDefinition.set = function () {
                          warn(
                            ("Computed property \"" + key + "\" was assigned to but it has no setter."),
                            this
                          );
                        };
                      }
                      Object.defineProperty(target, key, sharedPropertyDefinition);
                    }
                  
                    function createComputedGetter (key) {
                      return function computedGetter () {
                        var watcher = this._computedWatchers && this._computedWatchers[key];
                        if (watcher) {
                          if (watcher.dirty) {
                            watcher.evaluate();
                          }
                          if (Dep.target) {
                            watcher.depend();
                          }
                          return watcher.value
                        }
                      }
                    }
                  
                    function createGetterInvoker(fn) {
                      return function computedGetter () {
                        return fn.call(this, this)
                      }
                    }
                  
                    function initMethods (vm, methods) {
                      var props = vm.$options.props;
                      for (var key in methods) {
                        {
                          if (typeof methods[key] !== 'function') {
                            warn(
                              "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
                              "Did you reference the function correctly?",
                              vm
                            );
                          }
                          if (props && hasOwn(props, key)) {
                            warn(
                              ("Method \"" + key + "\" has already been defined as a prop."),
                              vm
                            );
                          }
                          if ((key in vm) && isReserved(key)) {
                            warn(
                              "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
                              "Avoid defining component methods that start with _ or $."
                            );
                          }
                        }
                        vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
                      }
                    }
                  
                    function initWatch (vm, watch) {
                      for (var key in watch) {
                        var handler = watch[key];
                        if (Array.isArray(handler)) {
                          for (var i = 0; i < handler.length; i++) {
                            createWatcher(vm, key, handler[i]);
                          }
                        } else {
                          createWatcher(vm, key, handler);
                        }
                      }
                    }
                  
                    function createWatcher (
                      vm,
                      expOrFn,
                      handler,
                      options
                    ) {
                      if (isPlainObject(handler)) {
                        options = handler;
                        handler = handler.handler;
                      }
                      if (typeof handler === 'string') {
                        handler = vm[handler];
                      }
                      return vm.$watch(expOrFn, handler, options)
                    }
                  
                    function stateMixin (Vue) {
                      // flow somehow has problems with directly declared definition object
                      // when using Object.defineProperty, so we have to procedurally build up
                      // the object here.
                      var dataDef = {};
                      dataDef.get = function () { return this._data };
                      var propsDef = {};
                      propsDef.get = function () { return this._props };
                      {
                        dataDef.set = function () {
                          warn(
                            'Avoid replacing instance root $data. ' +
                            'Use nested data properties instead.',
                            this
                          );
                        };
                        propsDef.set = function () {
                          warn("$props is readonly.", this);
                        };
                      }
                      Object.defineProperty(Vue.prototype, '$data', dataDef);
                      Object.defineProperty(Vue.prototype, '$props', propsDef);
                  
                      Vue.prototype.$set = set;
                      Vue.prototype.$delete = del;
                  
                      Vue.prototype.$watch = function (
                        expOrFn,
                        cb,
                        options
                      ) {
                        var vm = this;
                        if (isPlainObject(cb)) {
                          return createWatcher(vm, expOrFn, cb, options)
                        }
                        options = options || {};
                        options.user = true;
                        var watcher = new Watcher(vm, expOrFn, cb, options);
                        if (options.immediate) {
                          try {
                            cb.call(vm, watcher.value);
                          } catch (error) {
                            handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
                          }
                        }
                        return function unwatchFn () {
                          watcher.teardown();
                        }
                      };
                    }
                  
                    /*  */
                  
                    var uid$3 = 0;
                  
                    function initMixin (Vue) {
                      Vue.prototype._init = function (options) {
                        var vm = this;
                        // a uid
                        vm._uid = uid$3++;
                  
                        var startTag, endTag;
                        /* istanbul ignore if */
                        if (config.performance && mark) {
                          startTag = "vue-perf-start:" + (vm._uid);
                          endTag = "vue-perf-end:" + (vm._uid);
                          mark(startTag);
                        }
                  
                        // a flag to avoid this being observed
                        vm._isVue = true;
                        // merge options
                        if (options && options._isComponent) {
                          // optimize internal component instantiation
                          // since dynamic options merging is pretty slow, and none of the
                          // internal component options needs special treatment.
                          initInternalComponent(vm, options);
                        } else {
                          vm.$options = mergeOptions(
                            resolveConstructorOptions(vm.constructor),
                            options || {},
                            vm
                          );
                        }
                        /* istanbul ignore else */
                        {
                          initProxy(vm);
                        }
                        // expose real self
                        vm._self = vm;
                        initLifecycle(vm);
                        initEvents(vm);
                        initRender(vm);
                        callHook(vm, 'beforeCreate');
                        initInjections(vm); // resolve injections before data/props
                        initState(vm);
                        initProvide(vm); // resolve provide after data/props
                        callHook(vm, 'created');
                  
                        /* istanbul ignore if */
                        if (config.performance && mark) {
                          vm._name = formatComponentName(vm, false);
                          mark(endTag);
                          measure(("vue " + (vm._name) + " init"), startTag, endTag);
                        }
                  
                        if (vm.$options.el) {
                          vm.$mount(vm.$options.el);
                        }
                      };
                    }
                  
                    function initInternalComponent (vm, options) {
                      var opts = vm.$options = Object.create(vm.constructor.options);
                      // doing this because it's faster than dynamic enumeration.
                      var parentVnode = options._parentVnode;
                      opts.parent = options.parent;
                      opts._parentVnode = parentVnode;
                  
                      var vnodeComponentOptions = parentVnode.componentOptions;
                      opts.propsData = vnodeComponentOptions.propsData;
                      opts._parentListeners = vnodeComponentOptions.listeners;
                      opts._renderChildren = vnodeComponentOptions.children;
                      opts._componentTag = vnodeComponentOptions.tag;
                  
                      if (options.render) {
                        opts.render = options.render;
                        opts.staticRenderFns = options.staticRenderFns;
                      }
                    }
                  
                    function resolveConstructorOptions (Ctor) {
                      var options = Ctor.options;
                      if (Ctor.super) {
                        var superOptions = resolveConstructorOptions(Ctor.super);
                        var cachedSuperOptions = Ctor.superOptions;
                        if (superOptions !== cachedSuperOptions) {
                          // super option changed,
                          // need to resolve new options.
                          Ctor.superOptions = superOptions;
                          // check if there are any late-modified/attached options (#4976)
                          var modifiedOptions = resolveModifiedOptions(Ctor);
                          // update base extend options
                          if (modifiedOptions) {
                            extend(Ctor.extendOptions, modifiedOptions);
                          }
                          options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
                          if (options.name) {
                            options.components[options.name] = Ctor;
                          }
                        }
                      }
                      return options
                    }
                  
                    function resolveModifiedOptions (Ctor) {
                      var modified;
                      var latest = Ctor.options;
                      var sealed = Ctor.sealedOptions;
                      for (var key in latest) {
                        if (latest[key] !== sealed[key]) {
                          if (!modified) { modified = {}; }
                          modified[key] = latest[key];
                        }
                      }
                      return modified
                    }
                  
                    function Vue (options) {
                      if (!(this instanceof Vue)
                      ) {
                        warn('Vue is a constructor and should be called with the `new` keyword');
                      }
                      this._init(options);
                    }
                  
                    initMixin(Vue);
                    stateMixin(Vue);
                    eventsMixin(Vue);
                    lifecycleMixin(Vue);
                    renderMixin(Vue);
                  
                    /*  */
                  
                    function initUse (Vue) {
                      Vue.use = function (plugin) {
                        var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
                        if (installedPlugins.indexOf(plugin) > -1) {
                          return this
                        }
                  
                        // additional parameters
                        var args = toArray(arguments, 1);
                        args.unshift(this);
                        if (typeof plugin.install === 'function') {
                          plugin.install.apply(plugin, args);
                        } else if (typeof plugin === 'function') {
                          plugin.apply(null, args);
                        }
                        installedPlugins.push(plugin);
                        return this
                      };
                    }
                  
                    /*  */
                  
                    function initMixin$1 (Vue) {
                      Vue.mixin = function (mixin) {
                        this.options = mergeOptions(this.options, mixin);
                        return this
                      };
                    }
                  
                    /*  */
                  
                    function initExtend (Vue) {
                      /**
                       * Each instance constructor, including Vue, has a unique
                       * cid. This enables us to create wrapped "child
                       * constructors" for prototypal inheritance and cache them.
                       */
                      Vue.cid = 0;
                      var cid = 1;
                  
                      /**
                       * Class inheritance
                       */
                      Vue.extend = function (extendOptions) {
                        extendOptions = extendOptions || {};
                        var Super = this;
                        var SuperId = Super.cid;
                        var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
                        if (cachedCtors[SuperId]) {
                          return cachedCtors[SuperId]
                        }
                  
                        var name = extendOptions.name || Super.options.name;
                        if (name) {
                          validateComponentName(name);
                        }
                  
                        var Sub = function VueComponent (options) {
                          this._init(options);
                        };
                        Sub.prototype = Object.create(Super.prototype);
                        Sub.prototype.constructor = Sub;
                        Sub.cid = cid++;
                        Sub.options = mergeOptions(
                          Super.options,
                          extendOptions
                        );
                        Sub['super'] = Super;
                  
                        // For props and computed properties, we define the proxy getters on
                        // the Vue instances at extension time, on the extended prototype. This
                        // avoids Object.defineProperty calls for each instance created.
                        if (Sub.options.props) {
                          initProps$1(Sub);
                        }
                        if (Sub.options.computed) {
                          initComputed$1(Sub);
                        }
                  
                        // allow further extension/mixin/plugin usage
                        Sub.extend = Super.extend;
                        Sub.mixin = Super.mixin;
                        Sub.use = Super.use;
                  
                        // create asset registers, so extended classes
                        // can have their private assets too.
                        ASSET_TYPES.forEach(function (type) {
                          Sub[type] = Super[type];
                        });
                        // enable recursive self-lookup
                        if (name) {
                          Sub.options.components[name] = Sub;
                        }
                  
                        // keep a reference to the super options at extension time.
                        // later at instantiation we can check if Super's options have
                        // been updated.
                        Sub.superOptions = Super.options;
                        Sub.extendOptions = extendOptions;
                        Sub.sealedOptions = extend({}, Sub.options);
                  
                        // cache constructor
                        cachedCtors[SuperId] = Sub;
                        return Sub
                      };
                    }
                  
                    function initProps$1 (Comp) {
                      var props = Comp.options.props;
                      for (var key in props) {
                        proxy(Comp.prototype, "_props", key);
                      }
                    }
                  
                    function initComputed$1 (Comp) {
                      var computed = Comp.options.computed;
                      for (var key in computed) {
                        defineComputed(Comp.prototype, key, computed[key]);
                      }
                    }
                  
                    /*  */
                  
                    function initAssetRegisters (Vue) {
                      /**
                       * Create asset registration methods.
                       */
                      ASSET_TYPES.forEach(function (type) {
                        Vue[type] = function (
                          id,
                          definition
                        ) {
                          if (!definition) {
                            return this.options[type + 's'][id]
                          } else {
                            /* istanbul ignore if */
                            if (type === 'component') {
                              validateComponentName(id);
                            }
                            if (type === 'component' && isPlainObject(definition)) {
                              definition.name = definition.name || id;
                              definition = this.options._base.extend(definition);
                            }
                            if (type === 'directive' && typeof definition === 'function') {
                              definition = { bind: definition, update: definition };
                            }
                            this.options[type + 's'][id] = definition;
                            return definition
                          }
                        };
                      });
                    }
                  
                    /*  */
                  
                  
                  
                    function getComponentName (opts) {
                      return opts && (opts.Ctor.options.name || opts.tag)
                    }
                  
                    function matches (pattern, name) {
                      if (Array.isArray(pattern)) {
                        return pattern.indexOf(name) > -1
                      } else if (typeof pattern === 'string') {
                        return pattern.split(',').indexOf(name) > -1
                      } else if (isRegExp(pattern)) {
                        return pattern.test(name)
                      }
                      /* istanbul ignore next */
                      return false
                    }
                  
                    function pruneCache (keepAliveInstance, filter) {
                      var cache = keepAliveInstance.cache;
                      var keys = keepAliveInstance.keys;
                      var _vnode = keepAliveInstance._vnode;
                      for (var key in cache) {
                        var cachedNode = cache[key];
                        if (cachedNode) {
                          var name = getComponentName(cachedNode.componentOptions);
                          if (name && !filter(name)) {
                            pruneCacheEntry(cache, key, keys, _vnode);
                          }
                        }
                      }
                    }
                  
                    function pruneCacheEntry (
                      cache,
                      key,
                      keys,
                      current
                    ) {
                      var cached$$1 = cache[key];
                      if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {
                        cached$$1.componentInstance.$destroy();
                      }
                      cache[key] = null;
                      remove(keys, key);
                    }
                  
                    var patternTypes = [String, RegExp, Array];
                  
                    var KeepAlive = {
                      name: 'keep-alive',
                      abstract: true,
                  
                      props: {
                        include: patternTypes,
                        exclude: patternTypes,
                        max: [String, Number]
                      },
                  
                      created: function created () {
                        this.cache = Object.create(null);
                        this.keys = [];
                      },
                  
                      destroyed: function destroyed () {
                        for (var key in this.cache) {
                          pruneCacheEntry(this.cache, key, this.keys);
                        }
                      },
                  
                      mounted: function mounted () {
                        var this$1 = this;
                  
                        this.$watch('include', function (val) {
                          pruneCache(this$1, function (name) { return matches(val, name); });
                        });
                        this.$watch('exclude', function (val) {
                          pruneCache(this$1, function (name) { return !matches(val, name); });
                        });
                      },
                  
                      render: function render () {
                        var slot = this.$slots.default;
                        var vnode = getFirstComponentChild(slot);
                        var componentOptions = vnode && vnode.componentOptions;
                        if (componentOptions) {
                          // check pattern
                          var name = getComponentName(componentOptions);
                          var ref = this;
                          var include = ref.include;
                          var exclude = ref.exclude;
                          if (
                            // not included
                            (include && (!name || !matches(include, name))) ||
                            // excluded
                            (exclude && name && matches(exclude, name))
                          ) {
                            return vnode
                          }
                  
                          var ref$1 = this;
                          var cache = ref$1.cache;
                          var keys = ref$1.keys;
                          var key = vnode.key == null
                            // same constructor may get registered as different local components
                            // so cid alone is not enough (#3269)
                            ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
                            : vnode.key;
                          if (cache[key]) {
                            vnode.componentInstance = cache[key].componentInstance;
                            // make current key freshest
                            remove(keys, key);
                            keys.push(key);
                          } else {
                            cache[key] = vnode;
                            keys.push(key);
                            // prune oldest entry
                            if (this.max && keys.length > parseInt(this.max)) {
                              pruneCacheEntry(cache, keys[0], keys, this._vnode);
                            }
                          }
                  
                          vnode.data.keepAlive = true;
                        }
                        return vnode || (slot && slot[0])
                      }
                    };
                  
                    var builtInComponents = {
                      KeepAlive: KeepAlive
                    };
                  
                    /*  */
                  
                    function initGlobalAPI (Vue) {
                      // config
                      var configDef = {};
                      configDef.get = function () { return config; };
                      {
                        configDef.set = function () {
                          warn(
                            'Do not replace the Vue.config object, set individual fields instead.'
                          );
                        };
                      }
                      Object.defineProperty(Vue, 'config', configDef);
                  
                      // exposed util methods.
                      // NOTE: these are not considered part of the public API - avoid relying on
                      // them unless you are aware of the risk.
                      Vue.util = {
                        warn: warn,
                        extend: extend,
                        mergeOptions: mergeOptions,
                        defineReactive: defineReactive$$1
                      };
                  
                      Vue.set = set;
                      Vue.delete = del;
                      Vue.nextTick = nextTick;
                  
                      // 2.6 explicit observable API
                      Vue.observable = function (obj) {
                        observe(obj);
                        return obj
                      };
                  
                      Vue.options = Object.create(null);
                      ASSET_TYPES.forEach(function (type) {
                        Vue.options[type + 's'] = Object.create(null);
                      });
                  
                      // this is used to identify the "base" constructor to extend all plain-object
                      // components with in Weex's multi-instance scenarios.
                      Vue.options._base = Vue;
                  
                      extend(Vue.options.components, builtInComponents);
                  
                      initUse(Vue);
                      initMixin$1(Vue);
                      initExtend(Vue);
                      initAssetRegisters(Vue);
                    }
                  
                    initGlobalAPI(Vue);
                  
                    Object.defineProperty(Vue.prototype, '$isServer', {
                      get: isServerRendering
                    });
                  
                    Object.defineProperty(Vue.prototype, '$ssrContext', {
                      get: function get () {
                        /* istanbul ignore next */
                        return this.$vnode && this.$vnode.ssrContext
                      }
                    });
                  
                    // expose FunctionalRenderContext for ssr runtime helper installation
                    Object.defineProperty(Vue, 'FunctionalRenderContext', {
                      value: FunctionalRenderContext
                    });
                  
                    Vue.version = '2.6.11';
                  
                    /*  */
                  
                    // these are reserved for web because they are directly compiled away
                    // during template compilation
                    var isReservedAttr = makeMap('style,class');
                  
                    // attributes that should be using props for binding
                    var acceptValue = makeMap('input,textarea,option,select,progress');
                    var mustUseProp = function (tag, type, attr) {
                      return (
                        (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
                        (attr === 'selected' && tag === 'option') ||
                        (attr === 'checked' && tag === 'input') ||
                        (attr === 'muted' && tag === 'video')
                      )
                    };
                  
                    var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');
                  
                    var isValidContentEditableValue = makeMap('events,caret,typing,plaintext-only');
                  
                    var convertEnumeratedValue = function (key, value) {
                      return isFalsyAttrValue(value) || value === 'false'
                        ? 'false'
                        // allow arbitrary string value for contenteditable
                        : key === 'contenteditable' && isValidContentEditableValue(value)
                          ? value
                          : 'true'
                    };
                  
                    var isBooleanAttr = makeMap(
                      'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
                      'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
                      'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
                      'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
                      'required,reversed,scoped,seamless,selected,sortable,translate,' +
                      'truespeed,typemustmatch,visible'
                    );
                  
                    var xlinkNS = 'http://www.w3.org/1999/xlink';
                  
                    var isXlink = function (name) {
                      return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
                    };
                  
                    var getXlinkProp = function (name) {
                      return isXlink(name) ? name.slice(6, name.length) : ''
                    };
                  
                    var isFalsyAttrValue = function (val) {
                      return val == null || val === false
                    };
                  
                    /*  */
                  
                    function genClassForVnode (vnode) {
                      var data = vnode.data;
                      var parentNode = vnode;
                      var childNode = vnode;
                      while (isDef(childNode.componentInstance)) {
                        childNode = childNode.componentInstance._vnode;
                        if (childNode && childNode.data) {
                          data = mergeClassData(childNode.data, data);
                        }
                      }
                      while (isDef(parentNode = parentNode.parent)) {
                        if (parentNode && parentNode.data) {
                          data = mergeClassData(data, parentNode.data);
                        }
                      }
                      return renderClass(data.staticClass, data.class)
                    }
                  
                    function mergeClassData (child, parent) {
                      return {
                        staticClass: concat(child.staticClass, parent.staticClass),
                        class: isDef(child.class)
                          ? [child.class, parent.class]
                          : parent.class
                      }
                    }
                  
                    function renderClass (
                      staticClass,
                      dynamicClass
                    ) {
                      if (isDef(staticClass) || isDef(dynamicClass)) {
                        return concat(staticClass, stringifyClass(dynamicClass))
                      }
                      /* istanbul ignore next */
                      return ''
                    }
                  
                    function concat (a, b) {
                      return a ? b ? (a + ' ' + b) : a : (b || '')
                    }
                  
                    function stringifyClass (value) {
                      if (Array.isArray(value)) {
                        return stringifyArray(value)
                      }
                      if (isObject(value)) {
                        return stringifyObject(value)
                      }
                      if (typeof value === 'string') {
                        return value
                      }
                      /* istanbul ignore next */
                      return ''
                    }
                  
                    function stringifyArray (value) {
                      var res = '';
                      var stringified;
                      for (var i = 0, l = value.length; i < l; i++) {
                        if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
                          if (res) { res += ' '; }
                          res += stringified;
                        }
                      }
                      return res
                    }
                  
                    function stringifyObject (value) {
                      var res = '';
                      for (var key in value) {
                        if (value[key]) {
                          if (res) { res += ' '; }
                          res += key;
                        }
                      }
                      return res
                    }
                  
                    /*  */
                  
                    var namespaceMap = {
                      svg: 'http://www.w3.org/2000/svg',
                      math: 'http://www.w3.org/1998/Math/MathML'
                    };
                  
                    var isHTMLTag = makeMap(
                      'html,body,base,head,link,meta,style,title,' +
                      'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
                      'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
                      'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
                      's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
                      'embed,object,param,source,canvas,script,noscript,del,ins,' +
                      'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
                      'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
                      'output,progress,select,textarea,' +
                      'details,dialog,menu,menuitem,summary,' +
                      'content,element,shadow,template,blockquote,iframe,tfoot'
                    );
                  
                    // this map is intentionally selective, only covering SVG elements that may
                    // contain child elements.
                    var isSVG = makeMap(
                      'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
                      'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
                      'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
                      true
                    );
                  
                    var isPreTag = function (tag) { return tag === 'pre'; };
                  
                    var isReservedTag = function (tag) {
                      return isHTMLTag(tag) || isSVG(tag)
                    };
                  
                    function getTagNamespace (tag) {
                      if (isSVG(tag)) {
                        return 'svg'
                      }
                      // basic support for MathML
                      // note it doesn't support other MathML elements being component roots
                      if (tag === 'math') {
                        return 'math'
                      }
                    }
                  
                    var unknownElementCache = Object.create(null);
                    function isUnknownElement (tag) {
                      /* istanbul ignore if */
                      if (!inBrowser) {
                        return true
                      }
                      if (isReservedTag(tag)) {
                        return false
                      }
                      tag = tag.toLowerCase();
                      /* istanbul ignore if */
                      if (unknownElementCache[tag] != null) {
                        return unknownElementCache[tag]
                      }
                      var el = document.createElement(tag);
                      if (tag.indexOf('-') > -1) {
                        // http://stackoverflow.com/a/28210364/1070244
                        return (unknownElementCache[tag] = (
                          el.constructor === window.HTMLUnknownElement ||
                          el.constructor === window.HTMLElement
                        ))
                      } else {
                        return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
                      }
                    }
                  
                    var isTextInputType = makeMap('text,number,password,search,email,tel,url');
                  
                    /*  */
                  
                    /**
                     * Query an element selector if it's not an element already.
                     */
                    function query (el) {
                      if (typeof el === 'string') {
                        var selected = document.querySelector(el);
                        if (!selected) {
                          warn(
                            'Cannot find element: ' + el
                          );
                          return document.createElement('div')
                        }
                        return selected
                      } else {
                        return el
                      }
                    }
                  
                    /*  */
                  
                    function createElement$1 (tagName, vnode) {
                      var elm = document.createElement(tagName);
                      if (tagName !== 'select') {
                        return elm
                      }
                      // false or null will remove the attribute but undefined will not
                      if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
                        elm.setAttribute('multiple', 'multiple');
                      }
                      return elm
                    }
                  
                    function createElementNS (namespace, tagName) {
                      return document.createElementNS(namespaceMap[namespace], tagName)
                    }
                  
                    function createTextNode (text) {
                      return document.createTextNode(text)
                    }
                  
                    function createComment (text) {
                      return document.createComment(text)
                    }
                  
                    function insertBefore (parentNode, newNode, referenceNode) {
                      parentNode.insertBefore(newNode, referenceNode);
                    }
                  
                    function removeChild (node, child) {
                      node.removeChild(child);
                    }
                  
                    function appendChild (node, child) {
                      node.appendChild(child);
                    }
                  
                    function parentNode (node) {
                      return node.parentNode
                    }
                  
                    function nextSibling (node) {
                      return node.nextSibling
                    }
                  
                    function tagName (node) {
                      return node.tagName
                    }
                  
                    function setTextContent (node, text) {
                      node.textContent = text;
                    }
                  
                    function setStyleScope (node, scopeId) {
                      node.setAttribute(scopeId, '');
                    }
                  
                    var nodeOps = /*#__PURE__*/Object.freeze({
                      createElement: createElement$1,
                      createElementNS: createElementNS,
                      createTextNode: createTextNode,
                      createComment: createComment,
                      insertBefore: insertBefore,
                      removeChild: removeChild,
                      appendChild: appendChild,
                      parentNode: parentNode,
                      nextSibling: nextSibling,
                      tagName: tagName,
                      setTextContent: setTextContent,
                      setStyleScope: setStyleScope
                    });
                  
                    /*  */
                  
                    var ref = {
                      create: function create (_, vnode) {
                        registerRef(vnode);
                      },
                      update: function update (oldVnode, vnode) {
                        if (oldVnode.data.ref !== vnode.data.ref) {
                          registerRef(oldVnode, true);
                          registerRef(vnode);
                        }
                      },
                      destroy: function destroy (vnode) {
                        registerRef(vnode, true);
                      }
                    };
                  
                    function registerRef (vnode, isRemoval) {
                      var key = vnode.data.ref;
                      if (!isDef(key)) { return }
                  
                      var vm = vnode.context;
                      var ref = vnode.componentInstance || vnode.elm;
                      var refs = vm.$refs;
                      if (isRemoval) {
                        if (Array.isArray(refs[key])) {
                          remove(refs[key], ref);
                        } else if (refs[key] === ref) {
                          refs[key] = undefined;
                        }
                      } else {
                        if (vnode.data.refInFor) {
                          if (!Array.isArray(refs[key])) {
                            refs[key] = [ref];
                          } else if (refs[key].indexOf(ref) < 0) {
                            // $flow-disable-line
                            refs[key].push(ref);
                          }
                        } else {
                          refs[key] = ref;
                        }
                      }
                    }
                  
                    /**
                     * Virtual DOM patching algorithm based on Snabbdom by
                     * Simon Friis Vindum (@paldepind)
                     * Licensed under the MIT License
                     * https://github.com/paldepind/snabbdom/blob/master/LICENSE
                     *
                     * modified by Evan You (@yyx990803)
                     *
                     * Not type-checking this because this file is perf-critical and the cost
                     * of making flow understand it is not worth it.
                     */
                  
                    var emptyNode = new VNode('', {}, []);
                  
                    var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];
                  
                    function sameVnode (a, b) {
                      return (
                        a.key === b.key && (
                          (
                            a.tag === b.tag &&
                            a.isComment === b.isComment &&
                            isDef(a.data) === isDef(b.data) &&
                            sameInputType(a, b)
                          ) || (
                            isTrue(a.isAsyncPlaceholder) &&
                            a.asyncFactory === b.asyncFactory &&
                            isUndef(b.asyncFactory.error)
                          )
                        )
                      )
                    }
                  
                    function sameInputType (a, b) {
                      if (a.tag !== 'input') { return true }
                      var i;
                      var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
                      var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
                      return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
                    }
                  
                    function createKeyToOldIdx (children, beginIdx, endIdx) {
                      var i, key;
                      var map = {};
                      for (i = beginIdx; i <= endIdx; ++i) {
                        key = children[i].key;
                        if (isDef(key)) { map[key] = i; }
                      }
                      return map
                    }
                  
                    function createPatchFunction (backend) {
                      var i, j;
                      var cbs = {};
                  
                      var modules = backend.modules;
                      var nodeOps = backend.nodeOps;
                  
                      for (i = 0; i < hooks.length; ++i) {
                        cbs[hooks[i]] = [];
                        for (j = 0; j < modules.length; ++j) {
                          if (isDef(modules[j][hooks[i]])) {
                            cbs[hooks[i]].push(modules[j][hooks[i]]);
                          }
                        }
                      }
                  
                      function emptyNodeAt (elm) {
                        return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
                      }
                  
                      function createRmCb (childElm, listeners) {
                        function remove$$1 () {
                          if (--remove$$1.listeners === 0) {
                            removeNode(childElm);
                          }
                        }
                        remove$$1.listeners = listeners;
                        return remove$$1
                      }
                  
                      function removeNode (el) {
                        var parent = nodeOps.parentNode(el);
                        // element may have already been removed due to v-html / v-text
                        if (isDef(parent)) {
                          nodeOps.removeChild(parent, el);
                        }
                      }
                  
                      function isUnknownElement$$1 (vnode, inVPre) {
                        return (
                          !inVPre &&
                          !vnode.ns &&
                          !(
                            config.ignoredElements.length &&
                            config.ignoredElements.some(function (ignore) {
                              return isRegExp(ignore)
                                ? ignore.test(vnode.tag)
                                : ignore === vnode.tag
                            })
                          ) &&
                          config.isUnknownElement(vnode.tag)
                        )
                      }
                  
                      var creatingElmInVPre = 0;
                  
                      function createElm (
                        vnode,
                        insertedVnodeQueue,
                        parentElm,
                        refElm,
                        nested,
                        ownerArray,
                        index
                      ) {
                        if (isDef(vnode.elm) && isDef(ownerArray)) {
                          // This vnode was used in a previous render!
                          // now it's used as a new node, overwriting its elm would cause
                          // potential patch errors down the road when it's used as an insertion
                          // reference node. Instead, we clone the node on-demand before creating
                          // associated DOM element for it.
                          vnode = ownerArray[index] = cloneVNode(vnode);
                        }
                  
                        vnode.isRootInsert = !nested; // for transition enter check
                        if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
                          return
                        }
                  
                        var data = vnode.data;
                        var children = vnode.children;
                        var tag = vnode.tag;
                        if (isDef(tag)) {
                          {
                            if (data && data.pre) {
                              creatingElmInVPre++;
                            }
                            if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
                              warn(
                                'Unknown custom element: <' + tag + '> - did you ' +
                                'register the component correctly? For recursive components, ' +
                                'make sure to provide the "name" option.',
                                vnode.context
                              );
                            }
                          }
                  
                          vnode.elm = vnode.ns
                            ? nodeOps.createElementNS(vnode.ns, tag)
                            : nodeOps.createElement(tag, vnode);
                          setScope(vnode);
                  
                          /* istanbul ignore if */
                          {
                            createChildren(vnode, children, insertedVnodeQueue);
                            if (isDef(data)) {
                              invokeCreateHooks(vnode, insertedVnodeQueue);
                            }
                            insert(parentElm, vnode.elm, refElm);
                          }
                  
                          if (data && data.pre) {
                            creatingElmInVPre--;
                          }
                        } else if (isTrue(vnode.isComment)) {
                          vnode.elm = nodeOps.createComment(vnode.text);
                          insert(parentElm, vnode.elm, refElm);
                        } else {
                          vnode.elm = nodeOps.createTextNode(vnode.text);
                          insert(parentElm, vnode.elm, refElm);
                        }
                      }
                  
                      function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
                        var i = vnode.data;
                        if (isDef(i)) {
                          var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
                          if (isDef(i = i.hook) && isDef(i = i.init)) {
                            i(vnode, false /* hydrating */);
                          }
                          // after calling the init hook, if the vnode is a child component
                          // it should've created a child instance and mounted it. the child
                          // component also has set the placeholder vnode's elm.
                          // in that case we can just return the element and be done.
                          if (isDef(vnode.componentInstance)) {
                            initComponent(vnode, insertedVnodeQueue);
                            insert(parentElm, vnode.elm, refElm);
                            if (isTrue(isReactivated)) {
                              reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                            }
                            return true
                          }
                        }
                      }
                  
                      function initComponent (vnode, insertedVnodeQueue) {
                        if (isDef(vnode.data.pendingInsert)) {
                          insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
                          vnode.data.pendingInsert = null;
                        }
                        vnode.elm = vnode.componentInstance.$el;
                        if (isPatchable(vnode)) {
                          invokeCreateHooks(vnode, insertedVnodeQueue);
                          setScope(vnode);
                        } else {
                          // empty component root.
                          // skip all element-related modules except for ref (#3455)
                          registerRef(vnode);
                          // make sure to invoke the insert hook
                          insertedVnodeQueue.push(vnode);
                        }
                      }
                  
                      function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
                        var i;
                        // hack for #4339: a reactivated component with inner transition
                        // does not trigger because the inner node's created hooks are not called
                        // again. It's not ideal to involve module-specific logic in here but
                        // there doesn't seem to be a better way to do it.
                        var innerNode = vnode;
                        while (innerNode.componentInstance) {
                          innerNode = innerNode.componentInstance._vnode;
                          if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
                            for (i = 0; i < cbs.activate.length; ++i) {
                              cbs.activate[i](emptyNode, innerNode);
                            }
                            insertedVnodeQueue.push(innerNode);
                            break
                          }
                        }
                        // unlike a newly created component,
                        // a reactivated keep-alive component doesn't insert itself
                        insert(parentElm, vnode.elm, refElm);
                      }
                  
                      function insert (parent, elm, ref$$1) {
                        if (isDef(parent)) {
                          if (isDef(ref$$1)) {
                            if (nodeOps.parentNode(ref$$1) === parent) {
                              nodeOps.insertBefore(parent, elm, ref$$1);
                            }
                          } else {
                            nodeOps.appendChild(parent, elm);
                          }
                        }
                      }
                  
                      function createChildren (vnode, children, insertedVnodeQueue) {
                        if (Array.isArray(children)) {
                          {
                            checkDuplicateKeys(children);
                          }
                          for (var i = 0; i < children.length; ++i) {
                            createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
                          }
                        } else if (isPrimitive(vnode.text)) {
                          nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
                        }
                      }
                  
                      function isPatchable (vnode) {
                        while (vnode.componentInstance) {
                          vnode = vnode.componentInstance._vnode;
                        }
                        return isDef(vnode.tag)
                      }
                  
                      function invokeCreateHooks (vnode, insertedVnodeQueue) {
                        for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                          cbs.create[i$1](emptyNode, vnode);
                        }
                        i = vnode.data.hook; // Reuse variable
                        if (isDef(i)) {
                          if (isDef(i.create)) { i.create(emptyNode, vnode); }
                          if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
                        }
                      }
                  
                      // set scope id attribute for scoped CSS.
                      // this is implemented as a special case to avoid the overhead
                      // of going through the normal attribute patching process.
                      function setScope (vnode) {
                        var i;
                        if (isDef(i = vnode.fnScopeId)) {
                          nodeOps.setStyleScope(vnode.elm, i);
                        } else {
                          var ancestor = vnode;
                          while (ancestor) {
                            if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                              nodeOps.setStyleScope(vnode.elm, i);
                            }
                            ancestor = ancestor.parent;
                          }
                        }
                        // for slot content they should also get the scopeId from the host instance.
                        if (isDef(i = activeInstance) &&
                          i !== vnode.context &&
                          i !== vnode.fnContext &&
                          isDef(i = i.$options._scopeId)
                        ) {
                          nodeOps.setStyleScope(vnode.elm, i);
                        }
                      }
                  
                      function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
                        for (; startIdx <= endIdx; ++startIdx) {
                          createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
                        }
                      }
                  
                      function invokeDestroyHook (vnode) {
                        var i, j;
                        var data = vnode.data;
                        if (isDef(data)) {
                          if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
                          for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
                        }
                        if (isDef(i = vnode.children)) {
                          for (j = 0; j < vnode.children.length; ++j) {
                            invokeDestroyHook(vnode.children[j]);
                          }
                        }
                      }
                  
                      function removeVnodes (vnodes, startIdx, endIdx) {
                        for (; startIdx <= endIdx; ++startIdx) {
                          var ch = vnodes[startIdx];
                          if (isDef(ch)) {
                            if (isDef(ch.tag)) {
                              removeAndInvokeRemoveHook(ch);
                              invokeDestroyHook(ch);
                            } else { // Text node
                              removeNode(ch.elm);
                            }
                          }
                        }
                      }
                  
                      function removeAndInvokeRemoveHook (vnode, rm) {
                        if (isDef(rm) || isDef(vnode.data)) {
                          var i;
                          var listeners = cbs.remove.length + 1;
                          if (isDef(rm)) {
                            // we have a recursively passed down rm callback
                            // increase the listeners count
                            rm.listeners += listeners;
                          } else {
                            // directly removing
                            rm = createRmCb(vnode.elm, listeners);
                          }
                          // recursively invoke hooks on child component root node
                          if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                            removeAndInvokeRemoveHook(i, rm);
                          }
                          for (i = 0; i < cbs.remove.length; ++i) {
                            cbs.remove[i](vnode, rm);
                          }
                          if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                            i(vnode, rm);
                          } else {
                            rm();
                          }
                        } else {
                          removeNode(vnode.elm);
                        }
                      }
                  
                      function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
                        var oldStartIdx = 0;
                        var newStartIdx = 0;
                        var oldEndIdx = oldCh.length - 1;
                        var oldStartVnode = oldCh[0];
                        var oldEndVnode = oldCh[oldEndIdx];
                        var newEndIdx = newCh.length - 1;
                        var newStartVnode = newCh[0];
                        var newEndVnode = newCh[newEndIdx];
                        var oldKeyToIdx, idxInOld, vnodeToMove, refElm;
                  
                        // removeOnly is a special flag used only by <transition-group>
                        // to ensure removed elements stay in correct relative positions
                        // during leaving transitions
                        var canMove = !removeOnly;
                  
                        {
                          checkDuplicateKeys(newCh);
                        }
                  
                        while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
                          if (isUndef(oldStartVnode)) {
                            oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
                          } else if (isUndef(oldEndVnode)) {
                            oldEndVnode = oldCh[--oldEndIdx];
                          } else if (sameVnode(oldStartVnode, newStartVnode)) {
                            patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                            oldStartVnode = oldCh[++oldStartIdx];
                            newStartVnode = newCh[++newStartIdx];
                          } else if (sameVnode(oldEndVnode, newEndVnode)) {
                            patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                            oldEndVnode = oldCh[--oldEndIdx];
                            newEndVnode = newCh[--newEndIdx];
                          } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
                            patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                            canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                            oldStartVnode = oldCh[++oldStartIdx];
                            newEndVnode = newCh[--newEndIdx];
                          } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
                            patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                            canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                            oldEndVnode = oldCh[--oldEndIdx];
                            newStartVnode = newCh[++newStartIdx];
                          } else {
                            if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
                            idxInOld = isDef(newStartVnode.key)
                              ? oldKeyToIdx[newStartVnode.key]
                              : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                            if (isUndef(idxInOld)) { // New element
                              createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                            } else {
                              vnodeToMove = oldCh[idxInOld];
                              if (sameVnode(vnodeToMove, newStartVnode)) {
                                patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                                oldCh[idxInOld] = undefined;
                                canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                              } else {
                                // same key but different element. treat as new element
                                createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                              }
                            }
                            newStartVnode = newCh[++newStartIdx];
                          }
                        }
                        if (oldStartIdx > oldEndIdx) {
                          refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
                          addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
                        } else if (newStartIdx > newEndIdx) {
                          removeVnodes(oldCh, oldStartIdx, oldEndIdx);
                        }
                      }
                  
                      function checkDuplicateKeys (children) {
                        var seenKeys = {};
                        for (var i = 0; i < children.length; i++) {
                          var vnode = children[i];
                          var key = vnode.key;
                          if (isDef(key)) {
                            if (seenKeys[key]) {
                              warn(
                                ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
                                vnode.context
                              );
                            } else {
                              seenKeys[key] = true;
                            }
                          }
                        }
                      }
                  
                      function findIdxInOld (node, oldCh, start, end) {
                        for (var i = start; i < end; i++) {
                          var c = oldCh[i];
                          if (isDef(c) && sameVnode(node, c)) { return i }
                        }
                      }
                  
                      function patchVnode (
                        oldVnode,
                        vnode,
                        insertedVnodeQueue,
                        ownerArray,
                        index,
                        removeOnly
                      ) {
                        if (oldVnode === vnode) {
                          return
                        }
                  
                        if (isDef(vnode.elm) && isDef(ownerArray)) {
                          // clone reused vnode
                          vnode = ownerArray[index] = cloneVNode(vnode);
                        }
                  
                        var elm = vnode.elm = oldVnode.elm;
                  
                        if (isTrue(oldVnode.isAsyncPlaceholder)) {
                          if (isDef(vnode.asyncFactory.resolved)) {
                            hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
                          } else {
                            vnode.isAsyncPlaceholder = true;
                          }
                          return
                        }
                  
                        // reuse element for static trees.
                        // note we only do this if the vnode is cloned -
                        // if the new node is not cloned it means the render functions have been
                        // reset by the hot-reload-api and we need to do a proper re-render.
                        if (isTrue(vnode.isStatic) &&
                          isTrue(oldVnode.isStatic) &&
                          vnode.key === oldVnode.key &&
                          (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
                        ) {
                          vnode.componentInstance = oldVnode.componentInstance;
                          return
                        }
                  
                        var i;
                        var data = vnode.data;
                        if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
                          i(oldVnode, vnode);
                        }
                  
                        var oldCh = oldVnode.children;
                        var ch = vnode.children;
                        if (isDef(data) && isPatchable(vnode)) {
                          for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
                          if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
                        }
                        if (isUndef(vnode.text)) {
                          if (isDef(oldCh) && isDef(ch)) {
                            if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
                          } else if (isDef(ch)) {
                            {
                              checkDuplicateKeys(ch);
                            }
                            if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
                            addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
                          } else if (isDef(oldCh)) {
                            removeVnodes(oldCh, 0, oldCh.length - 1);
                          } else if (isDef(oldVnode.text)) {
                            nodeOps.setTextContent(elm, '');
                          }
                        } else if (oldVnode.text !== vnode.text) {
                          nodeOps.setTextContent(elm, vnode.text);
                        }
                        if (isDef(data)) {
                          if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
                        }
                      }
                  
                      function invokeInsertHook (vnode, queue, initial) {
                        // delay insert hooks for component root nodes, invoke them after the
                        // element is really inserted
                        if (isTrue(initial) && isDef(vnode.parent)) {
                          vnode.parent.data.pendingInsert = queue;
                        } else {
                          for (var i = 0; i < queue.length; ++i) {
                            queue[i].data.hook.insert(queue[i]);
                          }
                        }
                      }
                  
                      var hydrationBailed = false;
                      // list of modules that can skip create hook during hydration because they
                      // are already rendered on the client or has no need for initialization
                      // Note: style is excluded because it relies on initial clone for future
                      // deep updates (#7063).
                      var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');
                  
                      // Note: this is a browser-only function so we can assume elms are DOM nodes.
                      function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {
                        var i;
                        var tag = vnode.tag;
                        var data = vnode.data;
                        var children = vnode.children;
                        inVPre = inVPre || (data && data.pre);
                        vnode.elm = elm;
                  
                        if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
                          vnode.isAsyncPlaceholder = true;
                          return true
                        }
                        // assert node match
                        {
                          if (!assertNodeMatch(elm, vnode, inVPre)) {
                            return false
                          }
                        }
                        if (isDef(data)) {
                          if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
                          if (isDef(i = vnode.componentInstance)) {
                            // child component. it should have hydrated its own tree.
                            initComponent(vnode, insertedVnodeQueue);
                            return true
                          }
                        }
                        if (isDef(tag)) {
                          if (isDef(children)) {
                            // empty element, allow client to pick up and populate children
                            if (!elm.hasChildNodes()) {
                              createChildren(vnode, children, insertedVnodeQueue);
                            } else {
                              // v-html and domProps: innerHTML
                              if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
                                if (i !== elm.innerHTML) {
                                  /* istanbul ignore if */
                                  if (typeof console !== 'undefined' &&
                                    !hydrationBailed
                                  ) {
                                    hydrationBailed = true;
                                    console.warn('Parent: ', elm);
                                    console.warn('server innerHTML: ', i);
                                    console.warn('client innerHTML: ', elm.innerHTML);
                                  }
                                  return false
                                }
                              } else {
                                // iterate and compare children lists
                                var childrenMatch = true;
                                var childNode = elm.firstChild;
                                for (var i$1 = 0; i$1 < children.length; i$1++) {
                                  if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
                                    childrenMatch = false;
                                    break
                                  }
                                  childNode = childNode.nextSibling;
                                }
                                // if childNode is not null, it means the actual childNodes list is
                                // longer than the virtual children list.
                                if (!childrenMatch || childNode) {
                                  /* istanbul ignore if */
                                  if (typeof console !== 'undefined' &&
                                    !hydrationBailed
                                  ) {
                                    hydrationBailed = true;
                                    console.warn('Parent: ', elm);
                                    console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                                  }
                                  return false
                                }
                              }
                            }
                          }
                          if (isDef(data)) {
                            var fullInvoke = false;
                            for (var key in data) {
                              if (!isRenderedModule(key)) {
                                fullInvoke = true;
                                invokeCreateHooks(vnode, insertedVnodeQueue);
                                break
                              }
                            }
                            if (!fullInvoke && data['class']) {
                              // ensure collecting deps for deep class bindings for future updates
                              traverse(data['class']);
                            }
                          }
                        } else if (elm.data !== vnode.text) {
                          elm.data = vnode.text;
                        }
                        return true
                      }
                  
                      function assertNodeMatch (node, vnode, inVPre) {
                        if (isDef(vnode.tag)) {
                          return vnode.tag.indexOf('vue-component') === 0 || (
                            !isUnknownElement$$1(vnode, inVPre) &&
                            vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
                          )
                        } else {
                          return node.nodeType === (vnode.isComment ? 8 : 3)
                        }
                      }
                  
                      return function patch (oldVnode, vnode, hydrating, removeOnly) {
                        if (isUndef(vnode)) {
                          if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
                          return
                        }
                  
                        var isInitialPatch = false;
                        var insertedVnodeQueue = [];
                  
                        if (isUndef(oldVnode)) {
                          // empty mount (likely as component), create new root element
                          isInitialPatch = true;
                          createElm(vnode, insertedVnodeQueue);
                        } else {
                          var isRealElement = isDef(oldVnode.nodeType);
                          if (!isRealElement && sameVnode(oldVnode, vnode)) {
                            // patch existing root node
                            patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);
                          } else {
                            if (isRealElement) {
                              // mounting to a real element
                              // check if this is server-rendered content and if we can perform
                              // a successful hydration.
                              if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                                oldVnode.removeAttribute(SSR_ATTR);
                                hydrating = true;
                              }
                              if (isTrue(hydrating)) {
                                if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                                  invokeInsertHook(vnode, insertedVnodeQueue, true);
                                  return oldVnode
                                } else {
                                  warn(
                                    'The client-side rendered virtual DOM tree is not matching ' +
                                    'server-rendered content. This is likely caused by incorrect ' +
                                    'HTML markup, for example nesting block-level elements inside ' +
                                    '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                    'full client-side render.'
                                  );
                                }
                              }
                              // either not server-rendered, or hydration failed.
                              // create an empty node and replace it
                              oldVnode = emptyNodeAt(oldVnode);
                            }
                  
                            // replacing existing element
                            var oldElm = oldVnode.elm;
                            var parentElm = nodeOps.parentNode(oldElm);
                  
                            // create new node
                            createElm(
                              vnode,
                              insertedVnodeQueue,
                              // extremely rare edge case: do not insert if old element is in a
                              // leaving transition. Only happens when combining transition +
                              // keep-alive + HOCs. (#4590)
                              oldElm._leaveCb ? null : parentElm,
                              nodeOps.nextSibling(oldElm)
                            );
                  
                            // update parent placeholder node element, recursively
                            if (isDef(vnode.parent)) {
                              var ancestor = vnode.parent;
                              var patchable = isPatchable(vnode);
                              while (ancestor) {
                                for (var i = 0; i < cbs.destroy.length; ++i) {
                                  cbs.destroy[i](ancestor);
                                }
                                ancestor.elm = vnode.elm;
                                if (patchable) {
                                  for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                                    cbs.create[i$1](emptyNode, ancestor);
                                  }
                                  // #6513
                                  // invoke insert hooks that may have been merged by create hooks.
                                  // e.g. for directives that uses the "inserted" hook.
                                  var insert = ancestor.data.hook.insert;
                                  if (insert.merged) {
                                    // start at index 1 to avoid re-invoking component mounted hook
                                    for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                                      insert.fns[i$2]();
                                    }
                                  }
                                } else {
                                  registerRef(ancestor);
                                }
                                ancestor = ancestor.parent;
                              }
                            }
                  
                            // destroy old node
                            if (isDef(parentElm)) {
                              removeVnodes([oldVnode], 0, 0);
                            } else if (isDef(oldVnode.tag)) {
                              invokeDestroyHook(oldVnode);
                            }
                          }
                        }
                  
                        invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
                        return vnode.elm
                      }
                    }
                  
                    /*  */
                  
                    var directives = {
                      create: updateDirectives,
                      update: updateDirectives,
                      destroy: function unbindDirectives (vnode) {
                        updateDirectives(vnode, emptyNode);
                      }
                    };
                  
                    function updateDirectives (oldVnode, vnode) {
                      if (oldVnode.data.directives || vnode.data.directives) {
                        _update(oldVnode, vnode);
                      }
                    }
                  
                    function _update (oldVnode, vnode) {
                      var isCreate = oldVnode === emptyNode;
                      var isDestroy = vnode === emptyNode;
                      var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
                      var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);
                  
                      var dirsWithInsert = [];
                      var dirsWithPostpatch = [];
                  
                      var key, oldDir, dir;
                      for (key in newDirs) {
                        oldDir = oldDirs[key];
                        dir = newDirs[key];
                        if (!oldDir) {
                          // new directive, bind
                          callHook$1(dir, 'bind', vnode, oldVnode);
                          if (dir.def && dir.def.inserted) {
                            dirsWithInsert.push(dir);
                          }
                        } else {
                          // existing directive, update
                          dir.oldValue = oldDir.value;
                          dir.oldArg = oldDir.arg;
                          callHook$1(dir, 'update', vnode, oldVnode);
                          if (dir.def && dir.def.componentUpdated) {
                            dirsWithPostpatch.push(dir);
                          }
                        }
                      }
                  
                      if (dirsWithInsert.length) {
                        var callInsert = function () {
                          for (var i = 0; i < dirsWithInsert.length; i++) {
                            callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
                          }
                        };
                        if (isCreate) {
                          mergeVNodeHook(vnode, 'insert', callInsert);
                        } else {
                          callInsert();
                        }
                      }
                  
                      if (dirsWithPostpatch.length) {
                        mergeVNodeHook(vnode, 'postpatch', function () {
                          for (var i = 0; i < dirsWithPostpatch.length; i++) {
                            callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
                          }
                        });
                      }
                  
                      if (!isCreate) {
                        for (key in oldDirs) {
                          if (!newDirs[key]) {
                            // no longer present, unbind
                            callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
                          }
                        }
                      }
                    }
                  
                    var emptyModifiers = Object.create(null);
                  
                    function normalizeDirectives$1 (
                      dirs,
                      vm
                    ) {
                      var res = Object.create(null);
                      if (!dirs) {
                        // $flow-disable-line
                        return res
                      }
                      var i, dir;
                      for (i = 0; i < dirs.length; i++) {
                        dir = dirs[i];
                        if (!dir.modifiers) {
                          // $flow-disable-line
                          dir.modifiers = emptyModifiers;
                        }
                        res[getRawDirName(dir)] = dir;
                        dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
                      }
                      // $flow-disable-line
                      return res
                    }
                  
                    function getRawDirName (dir) {
                      return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
                    }
                  
                    function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
                      var fn = dir.def && dir.def[hook];
                      if (fn) {
                        try {
                          fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
                        } catch (e) {
                          handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
                        }
                      }
                    }
                  
                    var baseModules = [
                      ref,
                      directives
                    ];
                  
                    /*  */
                  
                    function updateAttrs (oldVnode, vnode) {
                      var opts = vnode.componentOptions;
                      if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
                        return
                      }
                      if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
                        return
                      }
                      var key, cur, old;
                      var elm = vnode.elm;
                      var oldAttrs = oldVnode.data.attrs || {};
                      var attrs = vnode.data.attrs || {};
                      // clone observed objects, as the user probably wants to mutate it
                      if (isDef(attrs.__ob__)) {
                        attrs = vnode.data.attrs = extend({}, attrs);
                      }
                  
                      for (key in attrs) {
                        cur = attrs[key];
                        old = oldAttrs[key];
                        if (old !== cur) {
                          setAttr(elm, key, cur);
                        }
                      }
                      // #4391: in IE9, setting type can reset value for input[type=radio]
                      // #6666: IE/Edge forces progress value down to 1 before setting a max
                      /* istanbul ignore if */
                      if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
                        setAttr(elm, 'value', attrs.value);
                      }
                      for (key in oldAttrs) {
                        if (isUndef(attrs[key])) {
                          if (isXlink(key)) {
                            elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
                          } else if (!isEnumeratedAttr(key)) {
                            elm.removeAttribute(key);
                          }
                        }
                      }
                    }
                  
                    function setAttr (el, key, value) {
                      if (el.tagName.indexOf('-') > -1) {
                        baseSetAttr(el, key, value);
                      } else if (isBooleanAttr(key)) {
                        // set attribute for blank value
                        // e.g. <option disabled>Select one</option>
                        if (isFalsyAttrValue(value)) {
                          el.removeAttribute(key);
                        } else {
                          // technically allowfullscreen is a boolean attribute for <iframe>,
                          // but Flash expects a value of "true" when used on <embed> tag
                          value = key === 'allowfullscreen' && el.tagName === 'EMBED'
                            ? 'true'
                            : key;
                          el.setAttribute(key, value);
                        }
                      } else if (isEnumeratedAttr(key)) {
                        el.setAttribute(key, convertEnumeratedValue(key, value));
                      } else if (isXlink(key)) {
                        if (isFalsyAttrValue(value)) {
                          el.removeAttributeNS(xlinkNS, getXlinkProp(key));
                        } else {
                          el.setAttributeNS(xlinkNS, key, value);
                        }
                      } else {
                        baseSetAttr(el, key, value);
                      }
                    }
                  
                    function baseSetAttr (el, key, value) {
                      if (isFalsyAttrValue(value)) {
                        el.removeAttribute(key);
                      } else {
                        // #7138: IE10 & 11 fires input event when setting placeholder on
                        // <textarea>... block the first input event and remove the blocker
                        // immediately.
                        /* istanbul ignore if */
                        if (
                          isIE && !isIE9 &&
                          el.tagName === 'TEXTAREA' &&
                          key === 'placeholder' && value !== '' && !el.__ieph
                        ) {
                          var blocker = function (e) {
                            e.stopImmediatePropagation();
                            el.removeEventListener('input', blocker);
                          };
                          el.addEventListener('input', blocker);
                          // $flow-disable-line
                          el.__ieph = true; /* IE placeholder patched */
                        }
                        el.setAttribute(key, value);
                      }
                    }
                  
                    var attrs = {
                      create: updateAttrs,
                      update: updateAttrs
                    };
                  
                    /*  */
                  
                    function updateClass (oldVnode, vnode) {
                      var el = vnode.elm;
                      var data = vnode.data;
                      var oldData = oldVnode.data;
                      if (
                        isUndef(data.staticClass) &&
                        isUndef(data.class) && (
                          isUndef(oldData) || (
                            isUndef(oldData.staticClass) &&
                            isUndef(oldData.class)
                          )
                        )
                      ) {
                        return
                      }
                  
                      var cls = genClassForVnode(vnode);
                  
                      // handle transition classes
                      var transitionClass = el._transitionClasses;
                      if (isDef(transitionClass)) {
                        cls = concat(cls, stringifyClass(transitionClass));
                      }
                  
                      // set the class
                      if (cls !== el._prevClass) {
                        el.setAttribute('class', cls);
                        el._prevClass = cls;
                      }
                    }
                  
                    var klass = {
                      create: updateClass,
                      update: updateClass
                    };
                  
                    /*  */
                  
                    var validDivisionCharRE = /[\w).+\-_$\]]/;
                  
                    function parseFilters (exp) {
                      var inSingle = false;
                      var inDouble = false;
                      var inTemplateString = false;
                      var inRegex = false;
                      var curly = 0;
                      var square = 0;
                      var paren = 0;
                      var lastFilterIndex = 0;
                      var c, prev, i, expression, filters;
                  
                      for (i = 0; i < exp.length; i++) {
                        prev = c;
                        c = exp.charCodeAt(i);
                        if (inSingle) {
                          if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
                        } else if (inDouble) {
                          if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
                        } else if (inTemplateString) {
                          if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
                        } else if (inRegex) {
                          if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
                        } else if (
                          c === 0x7C && // pipe
                          exp.charCodeAt(i + 1) !== 0x7C &&
                          exp.charCodeAt(i - 1) !== 0x7C &&
                          !curly && !square && !paren
                        ) {
                          if (expression === undefined) {
                            // first filter, end of expression
                            lastFilterIndex = i + 1;
                            expression = exp.slice(0, i).trim();
                          } else {
                            pushFilter();
                          }
                        } else {
                          switch (c) {
                            case 0x22: inDouble = true; break         // "
                            case 0x27: inSingle = true; break         // '
                            case 0x60: inTemplateString = true; break // `
                            case 0x28: paren++; break                 // (
                            case 0x29: paren--; break                 // )
                            case 0x5B: square++; break                // [
                            case 0x5D: square--; break                // ]
                            case 0x7B: curly++; break                 // {
                            case 0x7D: curly--; break                 // }
                          }
                          if (c === 0x2f) { // /
                            var j = i - 1;
                            var p = (void 0);
                            // find first non-whitespace prev char
                            for (; j >= 0; j--) {
                              p = exp.charAt(j);
                              if (p !== ' ') { break }
                            }
                            if (!p || !validDivisionCharRE.test(p)) {
                              inRegex = true;
                            }
                          }
                        }
                      }
                  
                      if (expression === undefined) {
                        expression = exp.slice(0, i).trim();
                      } else if (lastFilterIndex !== 0) {
                        pushFilter();
                      }
                  
                      function pushFilter () {
                        (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
                        lastFilterIndex = i + 1;
                      }
                  
                      if (filters) {
                        for (i = 0; i < filters.length; i++) {
                          expression = wrapFilter(expression, filters[i]);
                        }
                      }
                  
                      return expression
                    }
                  
                    function wrapFilter (exp, filter) {
                      var i = filter.indexOf('(');
                      if (i < 0) {
                        // _f: resolveFilter
                        return ("_f(\"" + filter + "\")(" + exp + ")")
                      } else {
                        var name = filter.slice(0, i);
                        var args = filter.slice(i + 1);
                        return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
                      }
                    }
                  
                    /*  */
                  
                  
                  
                    /* eslint-disable no-unused-vars */
                    function baseWarn (msg, range) {
                      console.error(("[Vue compiler]: " + msg));
                    }
                    /* eslint-enable no-unused-vars */
                  
                    function pluckModuleFunction (
                      modules,
                      key
                    ) {
                      return modules
                        ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
                        : []
                    }
                  
                    function addProp (el, name, value, range, dynamic) {
                      (el.props || (el.props = [])).push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
                      el.plain = false;
                    }
                  
                    function addAttr (el, name, value, range, dynamic) {
                      var attrs = dynamic
                        ? (el.dynamicAttrs || (el.dynamicAttrs = []))
                        : (el.attrs || (el.attrs = []));
                      attrs.push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
                      el.plain = false;
                    }
                  
                    // add a raw attr (use this in preTransforms)
                    function addRawAttr (el, name, value, range) {
                      el.attrsMap[name] = value;
                      el.attrsList.push(rangeSetItem({ name: name, value: value }, range));
                    }
                  
                    function addDirective (
                      el,
                      name,
                      rawName,
                      value,
                      arg,
                      isDynamicArg,
                      modifiers,
                      range
                    ) {
                      (el.directives || (el.directives = [])).push(rangeSetItem({
                        name: name,
                        rawName: rawName,
                        value: value,
                        arg: arg,
                        isDynamicArg: isDynamicArg,
                        modifiers: modifiers
                      }, range));
                      el.plain = false;
                    }
                  
                    function prependModifierMarker (symbol, name, dynamic) {
                      return dynamic
                        ? ("_p(" + name + ",\"" + symbol + "\")")
                        : symbol + name // mark the event as captured
                    }
                  
                    function addHandler (
                      el,
                      name,
                      value,
                      modifiers,
                      important,
                      warn,
                      range,
                      dynamic
                    ) {
                      modifiers = modifiers || emptyObject;
                      // warn prevent and passive modifier
                      /* istanbul ignore if */
                      if (
                        warn &&
                        modifiers.prevent && modifiers.passive
                      ) {
                        warn(
                          'passive and prevent can\'t be used together. ' +
                          'Passive handler can\'t prevent default event.',
                          range
                        );
                      }
                  
                      // normalize click.right and click.middle since they don't actually fire
                      // this is technically browser-specific, but at least for now browsers are
                      // the only target envs that have right/middle clicks.
                      if (modifiers.right) {
                        if (dynamic) {
                          name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
                        } else if (name === 'click') {
                          name = 'contextmenu';
                          delete modifiers.right;
                        }
                      } else if (modifiers.middle) {
                        if (dynamic) {
                          name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
                        } else if (name === 'click') {
                          name = 'mouseup';
                        }
                      }
                  
                      // check capture modifier
                      if (modifiers.capture) {
                        delete modifiers.capture;
                        name = prependModifierMarker('!', name, dynamic);
                      }
                      if (modifiers.once) {
                        delete modifiers.once;
                        name = prependModifierMarker('~', name, dynamic);
                      }
                      /* istanbul ignore if */
                      if (modifiers.passive) {
                        delete modifiers.passive;
                        name = prependModifierMarker('&', name, dynamic);
                      }
                  
                      var events;
                      if (modifiers.native) {
                        delete modifiers.native;
                        events = el.nativeEvents || (el.nativeEvents = {});
                      } else {
                        events = el.events || (el.events = {});
                      }
                  
                      var newHandler = rangeSetItem({ value: value.trim(), dynamic: dynamic }, range);
                      if (modifiers !== emptyObject) {
                        newHandler.modifiers = modifiers;
                      }
                  
                      var handlers = events[name];
                      /* istanbul ignore if */
                      if (Array.isArray(handlers)) {
                        important ? handlers.unshift(newHandler) : handlers.push(newHandler);
                      } else if (handlers) {
                        events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
                      } else {
                        events[name] = newHandler;
                      }
                  
                      el.plain = false;
                    }
                  
                    function getRawBindingAttr (
                      el,
                      name
                    ) {
                      return el.rawAttrsMap[':' + name] ||
                        el.rawAttrsMap['v-bind:' + name] ||
                        el.rawAttrsMap[name]
                    }
                  
                    function getBindingAttr (
                      el,
                      name,
                      getStatic
                    ) {
                      var dynamicValue =
                        getAndRemoveAttr(el, ':' + name) ||
                        getAndRemoveAttr(el, 'v-bind:' + name);
                      if (dynamicValue != null) {
                        return parseFilters(dynamicValue)
                      } else if (getStatic !== false) {
                        var staticValue = getAndRemoveAttr(el, name);
                        if (staticValue != null) {
                          return JSON.stringify(staticValue)
                        }
                      }
                    }
                  
                    // note: this only removes the attr from the Array (attrsList) so that it
                    // doesn't get processed by processAttrs.
                    // By default it does NOT remove it from the map (attrsMap) because the map is
                    // needed during codegen.
                    function getAndRemoveAttr (
                      el,
                      name,
                      removeFromMap
                    ) {
                      var val;
                      if ((val = el.attrsMap[name]) != null) {
                        var list = el.attrsList;
                        for (var i = 0, l = list.length; i < l; i++) {
                          if (list[i].name === name) {
                            list.splice(i, 1);
                            break
                          }
                        }
                      }
                      if (removeFromMap) {
                        delete el.attrsMap[name];
                      }
                      return val
                    }
                  
                    function getAndRemoveAttrByRegex (
                      el,
                      name
                    ) {
                      var list = el.attrsList;
                      for (var i = 0, l = list.length; i < l; i++) {
                        var attr = list[i];
                        if (name.test(attr.name)) {
                          list.splice(i, 1);
                          return attr
                        }
                      }
                    }
                  
                    function rangeSetItem (
                      item,
                      range
                    ) {
                      if (range) {
                        if (range.start != null) {
                          item.start = range.start;
                        }
                        if (range.end != null) {
                          item.end = range.end;
                        }
                      }
                      return item
                    }
                  
                    /*  */
                  
                    /**
                     * Cross-platform code generation for component v-model
                     */
                    function genComponentModel (
                      el,
                      value,
                      modifiers
                    ) {
                      var ref = modifiers || {};
                      var number = ref.number;
                      var trim = ref.trim;
                  
                      var baseValueExpression = '$$v';
                      var valueExpression = baseValueExpression;
                      if (trim) {
                        valueExpression =
                          "(typeof " + baseValueExpression + " === 'string'" +
                          "? " + baseValueExpression + ".trim()" +
                          ": " + baseValueExpression + ")";
                      }
                      if (number) {
                        valueExpression = "_n(" + valueExpression + ")";
                      }
                      var assignment = genAssignmentCode(value, valueExpression);
                  
                      el.model = {
                        value: ("(" + value + ")"),
                        expression: JSON.stringify(value),
                        callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
                      };
                    }
                  
                    /**
                     * Cross-platform codegen helper for generating v-model value assignment code.
                     */
                    function genAssignmentCode (
                      value,
                      assignment
                    ) {
                      var res = parseModel(value);
                      if (res.key === null) {
                        return (value + "=" + assignment)
                      } else {
                        return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
                      }
                    }
                  
                    /**
                     * Parse a v-model expression into a base path and a final key segment.
                     * Handles both dot-path and possible square brackets.
                     *
                     * Possible cases:
                     *
                     * - test
                     * - test[key]
                     * - test[test1[key]]
                     * - test["a"][key]
                     * - xxx.test[a[a].test1[key]]
                     * - test.xxx.a["asa"][test1[key]]
                     *
                     */
                  
                    var len, str, chr, index$1, expressionPos, expressionEndPos;
                  
                  
                  
                    function parseModel (val) {
                      // Fix https://github.com/vuejs/vue/pull/7730
                      // allow v-model="obj.val " (trailing whitespace)
                      val = val.trim();
                      len = val.length;
                  
                      if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
                        index$1 = val.lastIndexOf('.');
                        if (index$1 > -1) {
                          return {
                            exp: val.slice(0, index$1),
                            key: '"' + val.slice(index$1 + 1) + '"'
                          }
                        } else {
                          return {
                            exp: val,
                            key: null
                          }
                        }
                      }
                  
                      str = val;
                      index$1 = expressionPos = expressionEndPos = 0;
                  
                      while (!eof()) {
                        chr = next();
                        /* istanbul ignore if */
                        if (isStringStart(chr)) {
                          parseString(chr);
                        } else if (chr === 0x5B) {
                          parseBracket(chr);
                        }
                      }
                  
                      return {
                        exp: val.slice(0, expressionPos),
                        key: val.slice(expressionPos + 1, expressionEndPos)
                      }
                    }
                  
                    function next () {
                      return str.charCodeAt(++index$1)
                    }
                  
                    function eof () {
                      return index$1 >= len
                    }
                  
                    function isStringStart (chr) {
                      return chr === 0x22 || chr === 0x27
                    }
                  
                    function parseBracket (chr) {
                      var inBracket = 1;
                      expressionPos = index$1;
                      while (!eof()) {
                        chr = next();
                        if (isStringStart(chr)) {
                          parseString(chr);
                          continue
                        }
                        if (chr === 0x5B) { inBracket++; }
                        if (chr === 0x5D) { inBracket--; }
                        if (inBracket === 0) {
                          expressionEndPos = index$1;
                          break
                        }
                      }
                    }
                  
                    function parseString (chr) {
                      var stringQuote = chr;
                      while (!eof()) {
                        chr = next();
                        if (chr === stringQuote) {
                          break
                        }
                      }
                    }
                  
                    /*  */
                  
                    var warn$1;
                  
                    // in some cases, the event used has to be determined at runtime
                    // so we used some reserved tokens during compile.
                    var RANGE_TOKEN = '__r';
                    var CHECKBOX_RADIO_TOKEN = '__c';
                  
                    function model (
                      el,
                      dir,
                      _warn
                    ) {
                      warn$1 = _warn;
                      var value = dir.value;
                      var modifiers = dir.modifiers;
                      var tag = el.tag;
                      var type = el.attrsMap.type;
                  
                      {
                        // inputs with type="file" are read only and setting the input's
                        // value will throw an error.
                        if (tag === 'input' && type === 'file') {
                          warn$1(
                            "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                            "File inputs are read only. Use a v-on:change listener instead.",
                            el.rawAttrsMap['v-model']
                          );
                        }
                      }
                  
                      if (el.component) {
                        genComponentModel(el, value, modifiers);
                        // component v-model doesn't need extra runtime
                        return false
                      } else if (tag === 'select') {
                        genSelect(el, value, modifiers);
                      } else if (tag === 'input' && type === 'checkbox') {
                        genCheckboxModel(el, value, modifiers);
                      } else if (tag === 'input' && type === 'radio') {
                        genRadioModel(el, value, modifiers);
                      } else if (tag === 'input' || tag === 'textarea') {
                        genDefaultModel(el, value, modifiers);
                      } else if (!config.isReservedTag(tag)) {
                        genComponentModel(el, value, modifiers);
                        // component v-model doesn't need extra runtime
                        return false
                      } else {
                        warn$1(
                          "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                          "v-model is not supported on this element type. " +
                          'If you are working with contenteditable, it\'s recommended to ' +
                          'wrap a library dedicated for that purpose inside a custom component.',
                          el.rawAttrsMap['v-model']
                        );
                      }
                  
                      // ensure runtime directive metadata
                      return true
                    }
                  
                    function genCheckboxModel (
                      el,
                      value,
                      modifiers
                    ) {
                      var number = modifiers && modifiers.number;
                      var valueBinding = getBindingAttr(el, 'value') || 'null';
                      var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
                      var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
                      addProp(el, 'checked',
                        "Array.isArray(" + value + ")" +
                        "?_i(" + value + "," + valueBinding + ")>-1" + (
                          trueValueBinding === 'true'
                            ? (":(" + value + ")")
                            : (":_q(" + value + "," + trueValueBinding + ")")
                        )
                      );
                      addHandler(el, 'change',
                        "var $$a=" + value + "," +
                            '$$el=$event.target,' +
                            "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
                        'if(Array.isArray($$a)){' +
                          "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
                              '$$i=_i($$a,$$v);' +
                          "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
                          "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
                        "}else{" + (genAssignmentCode(value, '$$c')) + "}",
                        null, true
                      );
                    }
                  
                    function genRadioModel (
                      el,
                      value,
                      modifiers
                    ) {
                      var number = modifiers && modifiers.number;
                      var valueBinding = getBindingAttr(el, 'value') || 'null';
                      valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
                      addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
                      addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
                    }
                  
                    function genSelect (
                      el,
                      value,
                      modifiers
                    ) {
                      var number = modifiers && modifiers.number;
                      var selectedVal = "Array.prototype.filter" +
                        ".call($event.target.options,function(o){return o.selected})" +
                        ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
                        "return " + (number ? '_n(val)' : 'val') + "})";
                  
                      var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
                      var code = "var $$selectedVal = " + selectedVal + ";";
                      code = code + " " + (genAssignmentCode(value, assignment));
                      addHandler(el, 'change', code, null, true);
                    }
                  
                    function genDefaultModel (
                      el,
                      value,
                      modifiers
                    ) {
                      var type = el.attrsMap.type;
                  
                      // warn if v-bind:value conflicts with v-model
                      // except for inputs with v-bind:type
                      {
                        var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
                        var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
                        if (value$1 && !typeBinding) {
                          var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
                          warn$1(
                            binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
                            'because the latter already expands to a value binding internally',
                            el.rawAttrsMap[binding]
                          );
                        }
                      }
                  
                      var ref = modifiers || {};
                      var lazy = ref.lazy;
                      var number = ref.number;
                      var trim = ref.trim;
                      var needCompositionGuard = !lazy && type !== 'range';
                      var event = lazy
                        ? 'change'
                        : type === 'range'
                          ? RANGE_TOKEN
                          : 'input';
                  
                      var valueExpression = '$event.target.value';
                      if (trim) {
                        valueExpression = "$event.target.value.trim()";
                      }
                      if (number) {
                        valueExpression = "_n(" + valueExpression + ")";
                      }
                  
                      var code = genAssignmentCode(value, valueExpression);
                      if (needCompositionGuard) {
                        code = "if($event.target.composing)return;" + code;
                      }
                  
                      addProp(el, 'value', ("(" + value + ")"));
                      addHandler(el, event, code, null, true);
                      if (trim || number) {
                        addHandler(el, 'blur', '$forceUpdate()');
                      }
                    }
                  
                    /*  */
                  
                    // normalize v-model event tokens that can only be determined at runtime.
                    // it's important to place the event as the first in the array because
                    // the whole point is ensuring the v-model callback gets called before
                    // user-attached handlers.
                    function normalizeEvents (on) {
                      /* istanbul ignore if */
                      if (isDef(on[RANGE_TOKEN])) {
                        // IE input[type=range] only supports `change` event
                        var event = isIE ? 'change' : 'input';
                        on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
                        delete on[RANGE_TOKEN];
                      }
                      // This was originally intended to fix #4521 but no longer necessary
                      // after 2.5. Keeping it for backwards compat with generated code from < 2.4
                      /* istanbul ignore if */
                      if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
                        on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
                        delete on[CHECKBOX_RADIO_TOKEN];
                      }
                    }
                  
                    var target$1;
                  
                    function createOnceHandler$1 (event, handler, capture) {
                      var _target = target$1; // save current target element in closure
                      return function onceHandler () {
                        var res = handler.apply(null, arguments);
                        if (res !== null) {
                          remove$2(event, onceHandler, capture, _target);
                        }
                      }
                    }
                  
                    // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
                    // implementation and does not fire microtasks in between event propagation, so
                    // safe to exclude.
                    var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
                  
                    function add$1 (
                      name,
                      handler,
                      capture,
                      passive
                    ) {
                      // async edge case #6566: inner click event triggers patch, event handler
                      // attached to outer element during patch, and triggered again. This
                      // happens because browsers fire microtask ticks between event propagation.
                      // the solution is simple: we save the timestamp when a handler is attached,
                      // and the handler would only fire if the event passed to it was fired
                      // AFTER it was attached.
                      if (useMicrotaskFix) {
                        var attachedTimestamp = currentFlushTimestamp;
                        var original = handler;
                        handler = original._wrapper = function (e) {
                          if (
                            // no bubbling, should always fire.
                            // this is just a safety net in case event.timeStamp is unreliable in
                            // certain weird environments...
                            e.target === e.currentTarget ||
                            // event is fired after handler attachment
                            e.timeStamp >= attachedTimestamp ||
                            // bail for environments that have buggy event.timeStamp implementations
                            // #9462 iOS 9 bug: event.timeStamp is 0 after history.pushState
                            // #9681 QtWebEngine event.timeStamp is negative value
                            e.timeStamp <= 0 ||
                            // #9448 bail if event is fired in another document in a multi-page
                            // electron/nw.js app, since event.timeStamp will be using a different
                            // starting reference
                            e.target.ownerDocument !== document
                          ) {
                            return original.apply(this, arguments)
                          }
                        };
                      }
                      target$1.addEventListener(
                        name,
                        handler,
                        supportsPassive
                          ? { capture: capture, passive: passive }
                          : capture
                      );
                    }
                  
                    function remove$2 (
                      name,
                      handler,
                      capture,
                      _target
                    ) {
                      (_target || target$1).removeEventListener(
                        name,
                        handler._wrapper || handler,
                        capture
                      );
                    }
                  
                    function updateDOMListeners (oldVnode, vnode) {
                      if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
                        return
                      }
                      var on = vnode.data.on || {};
                      var oldOn = oldVnode.data.on || {};
                      target$1 = vnode.elm;
                      normalizeEvents(on);
                      updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);
                      target$1 = undefined;
                    }
                  
                    var events = {
                      create: updateDOMListeners,
                      update: updateDOMListeners
                    };
                  
                    /*  */
                  
                    var svgContainer;
                  
                    function updateDOMProps (oldVnode, vnode) {
                      if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
                        return
                      }
                      var key, cur;
                      var elm = vnode.elm;
                      var oldProps = oldVnode.data.domProps || {};
                      var props = vnode.data.domProps || {};
                      // clone observed objects, as the user probably wants to mutate it
                      if (isDef(props.__ob__)) {
                        props = vnode.data.domProps = extend({}, props);
                      }
                  
                      for (key in oldProps) {
                        if (!(key in props)) {
                          elm[key] = '';
                        }
                      }
                  
                      for (key in props) {
                        cur = props[key];
                        // ignore children if the node has textContent or innerHTML,
                        // as these will throw away existing DOM nodes and cause removal errors
                        // on subsequent patches (#3360)
                        if (key === 'textContent' || key === 'innerHTML') {
                          if (vnode.children) { vnode.children.length = 0; }
                          if (cur === oldProps[key]) { continue }
                          // #6601 work around Chrome version <= 55 bug where single textNode
                          // replaced by innerHTML/textContent retains its parentNode property
                          if (elm.childNodes.length === 1) {
                            elm.removeChild(elm.childNodes[0]);
                          }
                        }
                  
                        if (key === 'value' && elm.tagName !== 'PROGRESS') {
                          // store value as _value as well since
                          // non-string values will be stringified
                          elm._value = cur;
                          // avoid resetting cursor position when value is the same
                          var strCur = isUndef(cur) ? '' : String(cur);
                          if (shouldUpdateValue(elm, strCur)) {
                            elm.value = strCur;
                          }
                        } else if (key === 'innerHTML' && isSVG(elm.tagName) && isUndef(elm.innerHTML)) {
                          // IE doesn't support innerHTML for SVG elements
                          svgContainer = svgContainer || document.createElement('div');
                          svgContainer.innerHTML = "<svg>" + cur + "</svg>";
                          var svg = svgContainer.firstChild;
                          while (elm.firstChild) {
                            elm.removeChild(elm.firstChild);
                          }
                          while (svg.firstChild) {
                            elm.appendChild(svg.firstChild);
                          }
                        } else if (
                          // skip the update if old and new VDOM state is the same.
                          // `value` is handled separately because the DOM value may be temporarily
                          // out of sync with VDOM state due to focus, composition and modifiers.
                          // This  #4521 by skipping the unnecesarry `checked` update.
                          cur !== oldProps[key]
                        ) {
                          // some property updates can throw
                          // e.g. `value` on <progress> w/ non-finite value
                          try {
                            elm[key] = cur;
                          } catch (e) {}
                        }
                      }
                    }
                  
                    // check platforms/web/util/attrs.js acceptValue
                  
                  
                    function shouldUpdateValue (elm, checkVal) {
                      return (!elm.composing && (
                        elm.tagName === 'OPTION' ||
                        isNotInFocusAndDirty(elm, checkVal) ||
                        isDirtyWithModifiers(elm, checkVal)
                      ))
                    }
                  
                    function isNotInFocusAndDirty (elm, checkVal) {
                      // return true when textbox (.number and .trim) loses focus and its value is
                      // not equal to the updated value
                      var notInFocus = true;
                      // #6157
                      // work around IE bug when accessing document.activeElement in an iframe
                      try { notInFocus = document.activeElement !== elm; } catch (e) {}
                      return notInFocus && elm.value !== checkVal
                    }
                  
                    function isDirtyWithModifiers (elm, newVal) {
                      var value = elm.value;
                      var modifiers = elm._vModifiers; // injected by v-model runtime
                      if (isDef(modifiers)) {
                        if (modifiers.number) {
                          return toNumber(value) !== toNumber(newVal)
                        }
                        if (modifiers.trim) {
                          return value.trim() !== newVal.trim()
                        }
                      }
                      return value !== newVal
                    }
                  
                    var domProps = {
                      create: updateDOMProps,
                      update: updateDOMProps
                    };
                  
                    /*  */
                  
                    var parseStyleText = cached(function (cssText) {
                      var res = {};
                      var listDelimiter = /;(?![^(]*\))/g;
                      var propertyDelimiter = /:(.+)/;
                      cssText.split(listDelimiter).forEach(function (item) {
                        if (item) {
                          var tmp = item.split(propertyDelimiter);
                          tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
                        }
                      });
                      return res
                    });
                  
                    // merge static and dynamic style data on the same vnode
                    function normalizeStyleData (data) {
                      var style = normalizeStyleBinding(data.style);
                      // static style is pre-processed into an object during compilation
                      // and is always a fresh object, so it's safe to merge into it
                      return data.staticStyle
                        ? extend(data.staticStyle, style)
                        : style
                    }
                  
                    // normalize possible array / string values into Object
                    function normalizeStyleBinding (bindingStyle) {
                      if (Array.isArray(bindingStyle)) {
                        return toObject(bindingStyle)
                      }
                      if (typeof bindingStyle === 'string') {
                        return parseStyleText(bindingStyle)
                      }
                      return bindingStyle
                    }
                  
                    /**
                     * parent component style should be after child's
                     * so that parent component's style could override it
                     */
                    function getStyle (vnode, checkChild) {
                      var res = {};
                      var styleData;
                  
                      if (checkChild) {
                        var childNode = vnode;
                        while (childNode.componentInstance) {
                          childNode = childNode.componentInstance._vnode;
                          if (
                            childNode && childNode.data &&
                            (styleData = normalizeStyleData(childNode.data))
                          ) {
                            extend(res, styleData);
                          }
                        }
                      }
                  
                      if ((styleData = normalizeStyleData(vnode.data))) {
                        extend(res, styleData);
                      }
                  
                      var parentNode = vnode;
                      while ((parentNode = parentNode.parent)) {
                        if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
                          extend(res, styleData);
                        }
                      }
                      return res
                    }
                  
                    /*  */
                  
                    var cssVarRE = /^--/;
                    var importantRE = /\s*!important$/;
                    var setProp = function (el, name, val) {
                      /* istanbul ignore if */
                      if (cssVarRE.test(name)) {
                        el.style.setProperty(name, val);
                      } else if (importantRE.test(val)) {
                        el.style.setProperty(hyphenate(name), val.replace(importantRE, ''), 'important');
                      } else {
                        var normalizedName = normalize(name);
                        if (Array.isArray(val)) {
                          // Support values array created by autoprefixer, e.g.
                          // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
                          // Set them one by one, and the browser will only set those it can recognize
                          for (var i = 0, len = val.length; i < len; i++) {
                            el.style[normalizedName] = val[i];
                          }
                        } else {
                          el.style[normalizedName] = val;
                        }
                      }
                    };
                  
                    var vendorNames = ['Webkit', 'Moz', 'ms'];
                  
                    var emptyStyle;
                    var normalize = cached(function (prop) {
                      emptyStyle = emptyStyle || document.createElement('div').style;
                      prop = camelize(prop);
                      if (prop !== 'filter' && (prop in emptyStyle)) {
                        return prop
                      }
                      var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
                      for (var i = 0; i < vendorNames.length; i++) {
                        var name = vendorNames[i] + capName;
                        if (name in emptyStyle) {
                          return name
                        }
                      }
                    });
                  
                    function updateStyle (oldVnode, vnode) {
                      var data = vnode.data;
                      var oldData = oldVnode.data;
                  
                      if (isUndef(data.staticStyle) && isUndef(data.style) &&
                        isUndef(oldData.staticStyle) && isUndef(oldData.style)
                      ) {
                        return
                      }
                  
                      var cur, name;
                      var el = vnode.elm;
                      var oldStaticStyle = oldData.staticStyle;
                      var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};
                  
                      // if static style exists, stylebinding already merged into it when doing normalizeStyleData
                      var oldStyle = oldStaticStyle || oldStyleBinding;
                  
                      var style = normalizeStyleBinding(vnode.data.style) || {};
                  
                      // store normalized style under a different key for next diff
                      // make sure to clone it if it's reactive, since the user likely wants
                      // to mutate it.
                      vnode.data.normalizedStyle = isDef(style.__ob__)
                        ? extend({}, style)
                        : style;
                  
                      var newStyle = getStyle(vnode, true);
                  
                      for (name in oldStyle) {
                        if (isUndef(newStyle[name])) {
                          setProp(el, name, '');
                        }
                      }
                      for (name in newStyle) {
                        cur = newStyle[name];
                        if (cur !== oldStyle[name]) {
                          // ie9 setting to null has no effect, must use empty string
                          setProp(el, name, cur == null ? '' : cur);
                        }
                      }
                    }
                  
                    var style = {
                      create: updateStyle,
                      update: updateStyle
                    };
                  
                    /*  */
                  
                    var whitespaceRE = /\s+/;
                  
                    /**
                     * Add class with compatibility for SVG since classList is not supported on
                     * SVG elements in IE
                     */
                    function addClass (el, cls) {
                      /* istanbul ignore if */
                      if (!cls || !(cls = cls.trim())) {
                        return
                      }
                  
                      /* istanbul ignore else */
                      if (el.classList) {
                        if (cls.indexOf(' ') > -1) {
                          cls.split(whitespaceRE).forEach(function (c) { return el.classList.add(c); });
                        } else {
                          el.classList.add(cls);
                        }
                      } else {
                        var cur = " " + (el.getAttribute('class') || '') + " ";
                        if (cur.indexOf(' ' + cls + ' ') < 0) {
                          el.setAttribute('class', (cur + cls).trim());
                        }
                      }
                    }
                  
                    /**
                     * Remove class with compatibility for SVG since classList is not supported on
                     * SVG elements in IE
                     */
                    function removeClass (el, cls) {
                      /* istanbul ignore if */
                      if (!cls || !(cls = cls.trim())) {
                        return
                      }
                  
                      /* istanbul ignore else */
                      if (el.classList) {
                        if (cls.indexOf(' ') > -1) {
                          cls.split(whitespaceRE).forEach(function (c) { return el.classList.remove(c); });
                        } else {
                          el.classList.remove(cls);
                        }
                        if (!el.classList.length) {
                          el.removeAttribute('class');
                        }
                      } else {
                        var cur = " " + (el.getAttribute('class') || '') + " ";
                        var tar = ' ' + cls + ' ';
                        while (cur.indexOf(tar) >= 0) {
                          cur = cur.replace(tar, ' ');
                        }
                        cur = cur.trim();
                        if (cur) {
                          el.setAttribute('class', cur);
                        } else {
                          el.removeAttribute('class');
                        }
                      }
                    }
                  
                    /*  */
                  
                    function resolveTransition (def$$1) {
                      if (!def$$1) {
                        return
                      }
                      /* istanbul ignore else */
                      if (typeof def$$1 === 'object') {
                        var res = {};
                        if (def$$1.css !== false) {
                          extend(res, autoCssTransition(def$$1.name || 'v'));
                        }
                        extend(res, def$$1);
                        return res
                      } else if (typeof def$$1 === 'string') {
                        return autoCssTransition(def$$1)
                      }
                    }
                  
                    var autoCssTransition = cached(function (name) {
                      return {
                        enterClass: (name + "-enter"),
                        enterToClass: (name + "-enter-to"),
                        enterActiveClass: (name + "-enter-active"),
                        leaveClass: (name + "-leave"),
                        leaveToClass: (name + "-leave-to"),
                        leaveActiveClass: (name + "-leave-active")
                      }
                    });
                  
                    var hasTransition = inBrowser && !isIE9;
                    var TRANSITION = 'transition';
                    var ANIMATION = 'animation';
                  
                    // Transition property/event sniffing
                    var transitionProp = 'transition';
                    var transitionEndEvent = 'transitionend';
                    var animationProp = 'animation';
                    var animationEndEvent = 'animationend';
                    if (hasTransition) {
                      /* istanbul ignore if */
                      if (window.ontransitionend === undefined &&
                        window.onwebkittransitionend !== undefined
                      ) {
                        transitionProp = 'WebkitTransition';
                        transitionEndEvent = 'webkitTransitionEnd';
                      }
                      if (window.onanimationend === undefined &&
                        window.onwebkitanimationend !== undefined
                      ) {
                        animationProp = 'WebkitAnimation';
                        animationEndEvent = 'webkitAnimationEnd';
                      }
                    }
                  
                    // binding to window is necessary to make hot reload work in IE in strict mode
                    var raf = inBrowser
                      ? window.requestAnimationFrame
                        ? window.requestAnimationFrame.bind(window)
                        : setTimeout
                      : /* istanbul ignore next */ function (fn) { return fn(); };
                  
                    function nextFrame (fn) {
                      raf(function () {
                        raf(fn);
                      });
                    }
                  
                    function addTransitionClass (el, cls) {
                      var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
                      if (transitionClasses.indexOf(cls) < 0) {
                        transitionClasses.push(cls);
                        addClass(el, cls);
                      }
                    }
                  
                    function removeTransitionClass (el, cls) {
                      if (el._transitionClasses) {
                        remove(el._transitionClasses, cls);
                      }
                      removeClass(el, cls);
                    }
                  
                    function whenTransitionEnds (
                      el,
                      expectedType,
                      cb
                    ) {
                      var ref = getTransitionInfo(el, expectedType);
                      var type = ref.type;
                      var timeout = ref.timeout;
                      var propCount = ref.propCount;
                      if (!type) { return cb() }
                      var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
                      var ended = 0;
                      var end = function () {
                        el.removeEventListener(event, onEnd);
                        cb();
                      };
                      var onEnd = function (e) {
                        if (e.target === el) {
                          if (++ended >= propCount) {
                            end();
                          }
                        }
                      };
                      setTimeout(function () {
                        if (ended < propCount) {
                          end();
                        }
                      }, timeout + 1);
                      el.addEventListener(event, onEnd);
                    }
                  
                    var transformRE = /\b(transform|all)(,|$)/;
                  
                    function getTransitionInfo (el, expectedType) {
                      var styles = window.getComputedStyle(el);
                      // JSDOM may return undefined for transition properties
                      var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');
                      var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');
                      var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
                      var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');
                      var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');
                      var animationTimeout = getTimeout(animationDelays, animationDurations);
                  
                      var type;
                      var timeout = 0;
                      var propCount = 0;
                      /* istanbul ignore if */
                      if (expectedType === TRANSITION) {
                        if (transitionTimeout > 0) {
                          type = TRANSITION;
                          timeout = transitionTimeout;
                          propCount = transitionDurations.length;
                        }
                      } else if (expectedType === ANIMATION) {
                        if (animationTimeout > 0) {
                          type = ANIMATION;
                          timeout = animationTimeout;
                          propCount = animationDurations.length;
                        }
                      } else {
                        timeout = Math.max(transitionTimeout, animationTimeout);
                        type = timeout > 0
                          ? transitionTimeout > animationTimeout
                            ? TRANSITION
                            : ANIMATION
                          : null;
                        propCount = type
                          ? type === TRANSITION
                            ? transitionDurations.length
                            : animationDurations.length
                          : 0;
                      }
                      var hasTransform =
                        type === TRANSITION &&
                        transformRE.test(styles[transitionProp + 'Property']);
                      return {
                        type: type,
                        timeout: timeout,
                        propCount: propCount,
                        hasTransform: hasTransform
                      }
                    }
                  
                    function getTimeout (delays, durations) {
                      /* istanbul ignore next */
                      while (delays.length < durations.length) {
                        delays = delays.concat(delays);
                      }
                  
                      return Math.max.apply(null, durations.map(function (d, i) {
                        return toMs(d) + toMs(delays[i])
                      }))
                    }
                  
                    // Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers
                    // in a locale-dependent way, using a comma instead of a dot.
                    // If comma is not replaced with a dot, the input will be rounded down (i.e. acting
                    // as a floor function) causing unexpected behaviors
                    function toMs (s) {
                      return Number(s.slice(0, -1).replace(',', '.')) * 1000
                    }
                  
                    /*  */
                  
                    function enter (vnode, toggleDisplay) {
                      var el = vnode.elm;
                  
                      // call leave callback now
                      if (isDef(el._leaveCb)) {
                        el._leaveCb.cancelled = true;
                        el._leaveCb();
                      }
                  
                      var data = resolveTransition(vnode.data.transition);
                      if (isUndef(data)) {
                        return
                      }
                  
                      /* istanbul ignore if */
                      if (isDef(el._enterCb) || el.nodeType !== 1) {
                        return
                      }
                  
                      var css = data.css;
                      var type = data.type;
                      var enterClass = data.enterClass;
                      var enterToClass = data.enterToClass;
                      var enterActiveClass = data.enterActiveClass;
                      var appearClass = data.appearClass;
                      var appearToClass = data.appearToClass;
                      var appearActiveClass = data.appearActiveClass;
                      var beforeEnter = data.beforeEnter;
                      var enter = data.enter;
                      var afterEnter = data.afterEnter;
                      var enterCancelled = data.enterCancelled;
                      var beforeAppear = data.beforeAppear;
                      var appear = data.appear;
                      var afterAppear = data.afterAppear;
                      var appearCancelled = data.appearCancelled;
                      var duration = data.duration;
                  
                      // activeInstance will always be the <transition> component managing this
                      // transition. One edge case to check is when the <transition> is placed
                      // as the root node of a child component. In that case we need to check
                      // <transition>'s parent for appear check.
                      var context = activeInstance;
                      var transitionNode = activeInstance.$vnode;
                      while (transitionNode && transitionNode.parent) {
                        context = transitionNode.context;
                        transitionNode = transitionNode.parent;
                      }
                  
                      var isAppear = !context._isMounted || !vnode.isRootInsert;
                  
                      if (isAppear && !appear && appear !== '') {
                        return
                      }
                  
                      var startClass = isAppear && appearClass
                        ? appearClass
                        : enterClass;
                      var activeClass = isAppear && appearActiveClass
                        ? appearActiveClass
                        : enterActiveClass;
                      var toClass = isAppear && appearToClass
                        ? appearToClass
                        : enterToClass;
                  
                      var beforeEnterHook = isAppear
                        ? (beforeAppear || beforeEnter)
                        : beforeEnter;
                      var enterHook = isAppear
                        ? (typeof appear === 'function' ? appear : enter)
                        : enter;
                      var afterEnterHook = isAppear
                        ? (afterAppear || afterEnter)
                        : afterEnter;
                      var enterCancelledHook = isAppear
                        ? (appearCancelled || enterCancelled)
                        : enterCancelled;
                  
                      var explicitEnterDuration = toNumber(
                        isObject(duration)
                          ? duration.enter
                          : duration
                      );
                  
                      if (explicitEnterDuration != null) {
                        checkDuration(explicitEnterDuration, 'enter', vnode);
                      }
                  
                      var expectsCSS = css !== false && !isIE9;
                      var userWantsControl = getHookArgumentsLength(enterHook);
                  
                      var cb = el._enterCb = once(function () {
                        if (expectsCSS) {
                          removeTransitionClass(el, toClass);
                          removeTransitionClass(el, activeClass);
                        }
                        if (cb.cancelled) {
                          if (expectsCSS) {
                            removeTransitionClass(el, startClass);
                          }
                          enterCancelledHook && enterCancelledHook(el);
                        } else {
                          afterEnterHook && afterEnterHook(el);
                        }
                        el._enterCb = null;
                      });
                  
                      if (!vnode.data.show) {
                        // remove pending leave element on enter by injecting an insert hook
                        mergeVNodeHook(vnode, 'insert', function () {
                          var parent = el.parentNode;
                          var pendingNode = parent && parent._pending && parent._pending[vnode.key];
                          if (pendingNode &&
                            pendingNode.tag === vnode.tag &&
                            pendingNode.elm._leaveCb
                          ) {
                            pendingNode.elm._leaveCb();
                          }
                          enterHook && enterHook(el, cb);
                        });
                      }
                  
                      // start enter transition
                      beforeEnterHook && beforeEnterHook(el);
                      if (expectsCSS) {
                        addTransitionClass(el, startClass);
                        addTransitionClass(el, activeClass);
                        nextFrame(function () {
                          removeTransitionClass(el, startClass);
                          if (!cb.cancelled) {
                            addTransitionClass(el, toClass);
                            if (!userWantsControl) {
                              if (isValidDuration(explicitEnterDuration)) {
                                setTimeout(cb, explicitEnterDuration);
                              } else {
                                whenTransitionEnds(el, type, cb);
                              }
                            }
                          }
                        });
                      }
                  
                      if (vnode.data.show) {
                        toggleDisplay && toggleDisplay();
                        enterHook && enterHook(el, cb);
                      }
                  
                      if (!expectsCSS && !userWantsControl) {
                        cb();
                      }
                    }
                  
                    function leave (vnode, rm) {
                      var el = vnode.elm;
                  
                      // call enter callback now
                      if (isDef(el._enterCb)) {
                        el._enterCb.cancelled = true;
                        el._enterCb();
                      }
                  
                      var data = resolveTransition(vnode.data.transition);
                      if (isUndef(data) || el.nodeType !== 1) {
                        return rm()
                      }
                  
                      /* istanbul ignore if */
                      if (isDef(el._leaveCb)) {
                        return
                      }
                  
                      var css = data.css;
                      var type = data.type;
                      var leaveClass = data.leaveClass;
                      var leaveToClass = data.leaveToClass;
                      var leaveActiveClass = data.leaveActiveClass;
                      var beforeLeave = data.beforeLeave;
                      var leave = data.leave;
                      var afterLeave = data.afterLeave;
                      var leaveCancelled = data.leaveCancelled;
                      var delayLeave = data.delayLeave;
                      var duration = data.duration;
                  
                      var expectsCSS = css !== false && !isIE9;
                      var userWantsControl = getHookArgumentsLength(leave);
                  
                      var explicitLeaveDuration = toNumber(
                        isObject(duration)
                          ? duration.leave
                          : duration
                      );
                  
                      if (isDef(explicitLeaveDuration)) {
                        checkDuration(explicitLeaveDuration, 'leave', vnode);
                      }
                  
                      var cb = el._leaveCb = once(function () {
                        if (el.parentNode && el.parentNode._pending) {
                          el.parentNode._pending[vnode.key] = null;
                        }
                        if (expectsCSS) {
                          removeTransitionClass(el, leaveToClass);
                          removeTransitionClass(el, leaveActiveClass);
                        }
                        if (cb.cancelled) {
                          if (expectsCSS) {
                            removeTransitionClass(el, leaveClass);
                          }
                          leaveCancelled && leaveCancelled(el);
                        } else {
                          rm();
                          afterLeave && afterLeave(el);
                        }
                        el._leaveCb = null;
                      });
                  
                      if (delayLeave) {
                        delayLeave(performLeave);
                      } else {
                        performLeave();
                      }
                  
                      function performLeave () {
                        // the delayed leave may have already been cancelled
                        if (cb.cancelled) {
                          return
                        }
                        // record leaving element
                        if (!vnode.data.show && el.parentNode) {
                          (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
                        }
                        beforeLeave && beforeLeave(el);
                        if (expectsCSS) {
                          addTransitionClass(el, leaveClass);
                          addTransitionClass(el, leaveActiveClass);
                          nextFrame(function () {
                            removeTransitionClass(el, leaveClass);
                            if (!cb.cancelled) {
                              addTransitionClass(el, leaveToClass);
                              if (!userWantsControl) {
                                if (isValidDuration(explicitLeaveDuration)) {
                                  setTimeout(cb, explicitLeaveDuration);
                                } else {
                                  whenTransitionEnds(el, type, cb);
                                }
                              }
                            }
                          });
                        }
                        leave && leave(el, cb);
                        if (!expectsCSS && !userWantsControl) {
                          cb();
                        }
                      }
                    }
                  
                    // only used in dev mode
                    function checkDuration (val, name, vnode) {
                      if (typeof val !== 'number') {
                        warn(
                          "<transition> explicit " + name + " duration is not a valid number - " +
                          "got " + (JSON.stringify(val)) + ".",
                          vnode.context
                        );
                      } else if (isNaN(val)) {
                        warn(
                          "<transition> explicit " + name + " duration is NaN - " +
                          'the duration expression might be incorrect.',
                          vnode.context
                        );
                      }
                    }
                  
                    function isValidDuration (val) {
                      return typeof val === 'number' && !isNaN(val)
                    }
                  
                    /**
                     * Normalize a transition hook's argument length. The hook may be:
                     * - a merged hook (invoker) with the original in .fns
                     * - a wrapped component method (check ._length)
                     * - a plain function (.length)
                     */
                    function getHookArgumentsLength (fn) {
                      if (isUndef(fn)) {
                        return false
                      }
                      var invokerFns = fn.fns;
                      if (isDef(invokerFns)) {
                        // invoker
                        return getHookArgumentsLength(
                          Array.isArray(invokerFns)
                            ? invokerFns[0]
                            : invokerFns
                        )
                      } else {
                        return (fn._length || fn.length) > 1
                      }
                    }
                  
                    function _enter (_, vnode) {
                      if (vnode.data.show !== true) {
                        enter(vnode);
                      }
                    }
                  
                    var transition = inBrowser ? {
                      create: _enter,
                      activate: _enter,
                      remove: function remove$$1 (vnode, rm) {
                        /* istanbul ignore else */
                        if (vnode.data.show !== true) {
                          leave(vnode, rm);
                        } else {
                          rm();
                        }
                      }
                    } : {};
                  
                    var platformModules = [
                      attrs,
                      klass,
                      events,
                      domProps,
                      style,
                      transition
                    ];
                  
                    /*  */
                  
                    // the directive module should be applied last, after all
                    // built-in modules have been applied.
                    var modules = platformModules.concat(baseModules);
                  
                    var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });
                  
                    /**
                     * Not type checking this file because flow doesn't like attaching
                     * properties to Elements.
                     */
                  
                    /* istanbul ignore if */
                    if (isIE9) {
                      // http://www.matts411.com/post/internet-explorer-9-oninput/
                      document.addEventListener('selectionchange', function () {
                        var el = document.activeElement;
                        if (el && el.vmodel) {
                          trigger(el, 'input');
                        }
                      });
                    }
                  
                    var directive = {
                      inserted: function inserted (el, binding, vnode, oldVnode) {
                        if (vnode.tag === 'select') {
                          // #6903
                          if (oldVnode.elm && !oldVnode.elm._vOptions) {
                            mergeVNodeHook(vnode, 'postpatch', function () {
                              directive.componentUpdated(el, binding, vnode);
                            });
                          } else {
                            setSelected(el, binding, vnode.context);
                          }
                          el._vOptions = [].map.call(el.options, getValue);
                        } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
                          el._vModifiers = binding.modifiers;
                          if (!binding.modifiers.lazy) {
                            el.addEventListener('compositionstart', onCompositionStart);
                            el.addEventListener('compositionend', onCompositionEnd);
                            // Safari < 10.2 & UIWebView doesn't fire compositionend when
                            // switching focus before confirming composition choice
                            // this also fixes the issue where some browsers e.g. iOS Chrome
                            // fires "change" instead of "input" on autocomplete.
                            el.addEventListener('change', onCompositionEnd);
                            /* istanbul ignore if */
                            if (isIE9) {
                              el.vmodel = true;
                            }
                          }
                        }
                      },
                  
                      componentUpdated: function componentUpdated (el, binding, vnode) {
                        if (vnode.tag === 'select') {
                          setSelected(el, binding, vnode.context);
                          // in case the options rendered by v-for have changed,
                          // it's possible that the value is out-of-sync with the rendered options.
                          // detect such cases and filter out values that no longer has a matching
                          // option in the DOM.
                          var prevOptions = el._vOptions;
                          var curOptions = el._vOptions = [].map.call(el.options, getValue);
                          if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {
                            // trigger change event if
                            // no matching option found for at least one value
                            var needReset = el.multiple
                              ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })
                              : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
                            if (needReset) {
                              trigger(el, 'change');
                            }
                          }
                        }
                      }
                    };
                  
                    function setSelected (el, binding, vm) {
                      actuallySetSelected(el, binding, vm);
                      /* istanbul ignore if */
                      if (isIE || isEdge) {
                        setTimeout(function () {
                          actuallySetSelected(el, binding, vm);
                        }, 0);
                      }
                    }
                  
                    function actuallySetSelected (el, binding, vm) {
                      var value = binding.value;
                      var isMultiple = el.multiple;
                      if (isMultiple && !Array.isArray(value)) {
                        warn(
                          "<select multiple v-model=\"" + (binding.expression) + "\"> " +
                          "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
                          vm
                        );
                        return
                      }
                      var selected, option;
                      for (var i = 0, l = el.options.length; i < l; i++) {
                        option = el.options[i];
                        if (isMultiple) {
                          selected = looseIndexOf(value, getValue(option)) > -1;
                          if (option.selected !== selected) {
                            option.selected = selected;
                          }
                        } else {
                          if (looseEqual(getValue(option), value)) {
                            if (el.selectedIndex !== i) {
                              el.selectedIndex = i;
                            }
                            return
                          }
                        }
                      }
                      if (!isMultiple) {
                        el.selectedIndex = -1;
                      }
                    }
                  
                    function hasNoMatchingOption (value, options) {
                      return options.every(function (o) { return !looseEqual(o, value); })
                    }
                  
                    function getValue (option) {
                      return '_value' in option
                        ? option._value
                        : option.value
                    }
                  
                    function onCompositionStart (e) {
                      e.target.composing = true;
                    }
                  
                    function onCompositionEnd (e) {
                      // prevent triggering an input event for no reason
                      if (!e.target.composing) { return }
                      e.target.composing = false;
                      trigger(e.target, 'input');
                    }
                  
                    function trigger (el, type) {
                      var e = document.createEvent('HTMLEvents');
                      e.initEvent(type, true, true);
                      el.dispatchEvent(e);
                    }
                  
                    /*  */
                  
                    // recursively search for possible transition defined inside the component root
                    function locateNode (vnode) {
                      return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
                        ? locateNode(vnode.componentInstance._vnode)
                        : vnode
                    }
                  
                    var show = {
                      bind: function bind (el, ref, vnode) {
                        var value = ref.value;
                  
                        vnode = locateNode(vnode);
                        var transition$$1 = vnode.data && vnode.data.transition;
                        var originalDisplay = el.__vOriginalDisplay =
                          el.style.display === 'none' ? '' : el.style.display;
                        if (value && transition$$1) {
                          vnode.data.show = true;
                          enter(vnode, function () {
                            el.style.display = originalDisplay;
                          });
                        } else {
                          el.style.display = value ? originalDisplay : 'none';
                        }
                      },
                  
                      update: function update (el, ref, vnode) {
                        var value = ref.value;
                        var oldValue = ref.oldValue;
                  
                        /* istanbul ignore if */
                        if (!value === !oldValue) { return }
                        vnode = locateNode(vnode);
                        var transition$$1 = vnode.data && vnode.data.transition;
                        if (transition$$1) {
                          vnode.data.show = true;
                          if (value) {
                            enter(vnode, function () {
                              el.style.display = el.__vOriginalDisplay;
                            });
                          } else {
                            leave(vnode, function () {
                              el.style.display = 'none';
                            });
                          }
                        } else {
                          el.style.display = value ? el.__vOriginalDisplay : 'none';
                        }
                      },
                  
                      unbind: function unbind (
                        el,
                        binding,
                        vnode,
                        oldVnode,
                        isDestroy
                      ) {
                        if (!isDestroy) {
                          el.style.display = el.__vOriginalDisplay;
                        }
                      }
                    };
                  
                    var platformDirectives = {
                      model: directive,
                      show: show
                    };
                  
                    /*  */
                  
                    var transitionProps = {
                      name: String,
                      appear: Boolean,
                      css: Boolean,
                      mode: String,
                      type: String,
                      enterClass: String,
                      leaveClass: String,
                      enterToClass: String,
                      leaveToClass: String,
                      enterActiveClass: String,
                      leaveActiveClass: String,
                      appearClass: String,
                      appearActiveClass: String,
                      appearToClass: String,
                      duration: [Number, String, Object]
                    };
                  
                    // in case the child is also an abstract component, e.g. <keep-alive>
                    // we want to recursively retrieve the real component to be rendered
                    function getRealChild (vnode) {
                      var compOptions = vnode && vnode.componentOptions;
                      if (compOptions && compOptions.Ctor.options.abstract) {
                        return getRealChild(getFirstComponentChild(compOptions.children))
                      } else {
                        return vnode
                      }
                    }
                  
                    function extractTransitionData (comp) {
                      var data = {};
                      var options = comp.$options;
                      // props
                      for (var key in options.propsData) {
                        data[key] = comp[key];
                      }
                      // events.
                      // extract listeners and pass them directly to the transition methods
                      var listeners = options._parentListeners;
                      for (var key$1 in listeners) {
                        data[camelize(key$1)] = listeners[key$1];
                      }
                      return data
                    }
                  
                    function placeholder (h, rawChild) {
                      if (/\d-keep-alive$/.test(rawChild.tag)) {
                        return h('keep-alive', {
                          props: rawChild.componentOptions.propsData
                        })
                      }
                    }
                  
                    function hasParentTransition (vnode) {
                      while ((vnode = vnode.parent)) {
                        if (vnode.data.transition) {
                          return true
                        }
                      }
                    }
                  
                    function isSameChild (child, oldChild) {
                      return oldChild.key === child.key && oldChild.tag === child.tag
                    }
                  
                    var isNotTextNode = function (c) { return c.tag || isAsyncPlaceholder(c); };
                  
                    var isVShowDirective = function (d) { return d.name === 'show'; };
                  
                    var Transition = {
                      name: 'transition',
                      props: transitionProps,
                      abstract: true,
                  
                      render: function render (h) {
                        var this$1 = this;
                  
                        var children = this.$slots.default;
                        if (!children) {
                          return
                        }
                  
                        // filter out text nodes (possible whitespaces)
                        children = children.filter(isNotTextNode);
                        /* istanbul ignore if */
                        if (!children.length) {
                          return
                        }
                  
                        // warn multiple elements
                        if (children.length > 1) {
                          warn(
                            '<transition> can only be used on a single element. Use ' +
                            '<transition-group> for lists.',
                            this.$parent
                          );
                        }
                  
                        var mode = this.mode;
                  
                        // warn invalid mode
                        if (mode && mode !== 'in-out' && mode !== 'out-in'
                        ) {
                          warn(
                            'invalid <transition> mode: ' + mode,
                            this.$parent
                          );
                        }
                  
                        var rawChild = children[0];
                  
                        // if this is a component root node and the component's
                        // parent container node also has transition, skip.
                        if (hasParentTransition(this.$vnode)) {
                          return rawChild
                        }
                  
                        // apply transition data to child
                        // use getRealChild() to ignore abstract components e.g. keep-alive
                        var child = getRealChild(rawChild);
                        /* istanbul ignore if */
                        if (!child) {
                          return rawChild
                        }
                  
                        if (this._leaving) {
                          return placeholder(h, rawChild)
                        }
                  
                        // ensure a key that is unique to the vnode type and to this transition
                        // component instance. This key will be used to remove pending leaving nodes
                        // during entering.
                        var id = "__transition-" + (this._uid) + "-";
                        child.key = child.key == null
                          ? child.isComment
                            ? id + 'comment'
                            : id + child.tag
                          : isPrimitive(child.key)
                            ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
                            : child.key;
                  
                        var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
                        var oldRawChild = this._vnode;
                        var oldChild = getRealChild(oldRawChild);
                  
                        // mark v-show
                        // so that the transition module can hand over the control to the directive
                        if (child.data.directives && child.data.directives.some(isVShowDirective)) {
                          child.data.show = true;
                        }
                  
                        if (
                          oldChild &&
                          oldChild.data &&
                          !isSameChild(child, oldChild) &&
                          !isAsyncPlaceholder(oldChild) &&
                          // #6687 component root is a comment node
                          !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
                        ) {
                          // replace old child transition data with fresh one
                          // important for dynamic transitions!
                          var oldData = oldChild.data.transition = extend({}, data);
                          // handle transition mode
                          if (mode === 'out-in') {
                            // return placeholder node and queue update when leave finishes
                            this._leaving = true;
                            mergeVNodeHook(oldData, 'afterLeave', function () {
                              this$1._leaving = false;
                              this$1.$forceUpdate();
                            });
                            return placeholder(h, rawChild)
                          } else if (mode === 'in-out') {
                            if (isAsyncPlaceholder(child)) {
                              return oldRawChild
                            }
                            var delayedLeave;
                            var performLeave = function () { delayedLeave(); };
                            mergeVNodeHook(data, 'afterEnter', performLeave);
                            mergeVNodeHook(data, 'enterCancelled', performLeave);
                            mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
                          }
                        }
                  
                        return rawChild
                      }
                    };
                  
                    /*  */
                  
                    var props = extend({
                      tag: String,
                      moveClass: String
                    }, transitionProps);
                  
                    delete props.mode;
                  
                    var TransitionGroup = {
                      props: props,
                  
                      beforeMount: function beforeMount () {
                        var this$1 = this;
                  
                        var update = this._update;
                        this._update = function (vnode, hydrating) {
                          var restoreActiveInstance = setActiveInstance(this$1);
                          // force removing pass
                          this$1.__patch__(
                            this$1._vnode,
                            this$1.kept,
                            false, // hydrating
                            true // removeOnly (!important, avoids unnecessary moves)
                          );
                          this$1._vnode = this$1.kept;
                          restoreActiveInstance();
                          update.call(this$1, vnode, hydrating);
                        };
                      },
                  
                      render: function render (h) {
                        var tag = this.tag || this.$vnode.data.tag || 'span';
                        var map = Object.create(null);
                        var prevChildren = this.prevChildren = this.children;
                        var rawChildren = this.$slots.default || [];
                        var children = this.children = [];
                        var transitionData = extractTransitionData(this);
                  
                        for (var i = 0; i < rawChildren.length; i++) {
                          var c = rawChildren[i];
                          if (c.tag) {
                            if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                              children.push(c);
                              map[c.key] = c
                              ;(c.data || (c.data = {})).transition = transitionData;
                            } else {
                              var opts = c.componentOptions;
                              var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                              warn(("<transition-group> children must be keyed: <" + name + ">"));
                            }
                          }
                        }
                  
                        if (prevChildren) {
                          var kept = [];
                          var removed = [];
                          for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
                            var c$1 = prevChildren[i$1];
                            c$1.data.transition = transitionData;
                            c$1.data.pos = c$1.elm.getBoundingClientRect();
                            if (map[c$1.key]) {
                              kept.push(c$1);
                            } else {
                              removed.push(c$1);
                            }
                          }
                          this.kept = h(tag, null, kept);
                          this.removed = removed;
                        }
                  
                        return h(tag, null, children)
                      },
                  
                      updated: function updated () {
                        var children = this.prevChildren;
                        var moveClass = this.moveClass || ((this.name || 'v') + '-move');
                        if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
                          return
                        }
                  
                        // we divide the work into three loops to avoid mixing DOM reads and writes
                        // in each iteration - which helps prevent layout thrashing.
                        children.forEach(callPendingCbs);
                        children.forEach(recordPosition);
                        children.forEach(applyTranslation);
                  
                        // force reflow to put everything in position
                        // assign to this to avoid being removed in tree-shaking
                        // $flow-disable-line
                        this._reflow = document.body.offsetHeight;
                  
                        children.forEach(function (c) {
                          if (c.data.moved) {
                            var el = c.elm;
                            var s = el.style;
                            addTransitionClass(el, moveClass);
                            s.transform = s.WebkitTransform = s.transitionDuration = '';
                            el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
                              if (e && e.target !== el) {
                                return
                              }
                              if (!e || /transform$/.test(e.propertyName)) {
                                el.removeEventListener(transitionEndEvent, cb);
                                el._moveCb = null;
                                removeTransitionClass(el, moveClass);
                              }
                            });
                          }
                        });
                      },
                  
                      methods: {
                        hasMove: function hasMove (el, moveClass) {
                          /* istanbul ignore if */
                          if (!hasTransition) {
                            return false
                          }
                          /* istanbul ignore if */
                          if (this._hasMove) {
                            return this._hasMove
                          }
                          // Detect whether an element with the move class applied has
                          // CSS transitions. Since the element may be inside an entering
                          // transition at this very moment, we make a clone of it and remove
                          // all other transition classes applied to ensure only the move class
                          // is applied.
                          var clone = el.cloneNode();
                          if (el._transitionClasses) {
                            el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
                          }
                          addClass(clone, moveClass);
                          clone.style.display = 'none';
                          this.$el.appendChild(clone);
                          var info = getTransitionInfo(clone);
                          this.$el.removeChild(clone);
                          return (this._hasMove = info.hasTransform)
                        }
                      }
                    };
                  
                    function callPendingCbs (c) {
                      /* istanbul ignore if */
                      if (c.elm._moveCb) {
                        c.elm._moveCb();
                      }
                      /* istanbul ignore if */
                      if (c.elm._enterCb) {
                        c.elm._enterCb();
                      }
                    }
                  
                    function recordPosition (c) {
                      c.data.newPos = c.elm.getBoundingClientRect();
                    }
                  
                    function applyTranslation (c) {
                      var oldPos = c.data.pos;
                      var newPos = c.data.newPos;
                      var dx = oldPos.left - newPos.left;
                      var dy = oldPos.top - newPos.top;
                      if (dx || dy) {
                        c.data.moved = true;
                        var s = c.elm.style;
                        s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
                        s.transitionDuration = '0s';
                      }
                    }
                  
                    var platformComponents = {
                      Transition: Transition,
                      TransitionGroup: TransitionGroup
                    };
                  
                    /*  */
                  
                    // install platform specific utils
                    Vue.config.mustUseProp = mustUseProp;
                    Vue.config.isReservedTag = isReservedTag;
                    Vue.config.isReservedAttr = isReservedAttr;
                    Vue.config.getTagNamespace = getTagNamespace;
                    Vue.config.isUnknownElement = isUnknownElement;
                  
                    // install platform runtime directives & components
                    extend(Vue.options.directives, platformDirectives);
                    extend(Vue.options.components, platformComponents);
                  
                    // install platform patch function
                    Vue.prototype.__patch__ = inBrowser ? patch : noop;
                  
                    // public mount method
                    Vue.prototype.$mount = function (
                      el,
                      hydrating
                    ) {
                      el = el && inBrowser ? query(el) : undefined;
                      return mountComponent(this, el, hydrating)
                    };
                  
                    // devtools global hook
                    /* istanbul ignore next */
                    if (inBrowser) {
                      setTimeout(function () {
                        if (config.devtools) {
                          if (devtools) {
                            devtools.emit('init', Vue);
                          } else {
                            console[console.info ? 'info' : 'log'](
                              'Download the Vue Devtools extension for a better development experience:\n' +
                              'https://github.com/vuejs/vue-devtools'
                            );
                          }
                        }
                        if (config.productionTip !== false &&
                          typeof console !== 'undefined'
                        ) {
                          console[console.info ? 'info' : 'log'](
                            "You are running Vue in development mode.\n" +
                            "Make sure to turn on production mode when deploying for production.\n" +
                            "See more tips at https://vuejs.org/guide/deployment.html"
                          );
                        }
                      }, 0);
                    }
                  
                    /*  */
                  
                    var defaultTagRE = /\{\{((?:.|\r?\n)+?)\}\}/g;
                    var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
                  
                    var buildRegex = cached(function (delimiters) {
                      var open = delimiters[0].replace(regexEscapeRE, '\\$&');
                      var close = delimiters[1].replace(regexEscapeRE, '\\$&');
                      return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
                    });
                  
                  
                  
                    function parseText (
                      text,
                      delimiters
                    ) {
                      var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
                      if (!tagRE.test(text)) {
                        return
                      }
                      var tokens = [];
                      var rawTokens = [];
                      var lastIndex = tagRE.lastIndex = 0;
                      var match, index, tokenValue;
                      while ((match = tagRE.exec(text))) {
                        index = match.index;
                        // push text token
                        if (index > lastIndex) {
                          rawTokens.push(tokenValue = text.slice(lastIndex, index));
                          tokens.push(JSON.stringify(tokenValue));
                        }
                        // tag token
                        var exp = parseFilters(match[1].trim());
                        tokens.push(("_s(" + exp + ")"));
                        rawTokens.push({ '@binding': exp });
                        lastIndex = index + match[0].length;
                      }
                      if (lastIndex < text.length) {
                        rawTokens.push(tokenValue = text.slice(lastIndex));
                        tokens.push(JSON.stringify(tokenValue));
                      }
                      return {
                        expression: tokens.join('+'),
                        tokens: rawTokens
                      }
                    }
                  
                    /*  */
                  
                    function transformNode (el, options) {
                      var warn = options.warn || baseWarn;
                      var staticClass = getAndRemoveAttr(el, 'class');
                      if (staticClass) {
                        var res = parseText(staticClass, options.delimiters);
                        if (res) {
                          warn(
                            "class=\"" + staticClass + "\": " +
                            'Interpolation inside attributes has been removed. ' +
                            'Use v-bind or the colon shorthand instead. For example, ' +
                            'instead of <div class="{{ val }}">, use <div :class="val">.',
                            el.rawAttrsMap['class']
                          );
                        }
                      }
                      if (staticClass) {
                        el.staticClass = JSON.stringify(staticClass);
                      }
                      var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
                      if (classBinding) {
                        el.classBinding = classBinding;
                      }
                    }
                  
                    function genData (el) {
                      var data = '';
                      if (el.staticClass) {
                        data += "staticClass:" + (el.staticClass) + ",";
                      }
                      if (el.classBinding) {
                        data += "class:" + (el.classBinding) + ",";
                      }
                      return data
                    }
                  
                    var klass$1 = {
                      staticKeys: ['staticClass'],
                      transformNode: transformNode,
                      genData: genData
                    };
                  
                    /*  */
                  
                    function transformNode$1 (el, options) {
                      var warn = options.warn || baseWarn;
                      var staticStyle = getAndRemoveAttr(el, 'style');
                      if (staticStyle) {
                        /* istanbul ignore if */
                        {
                          var res = parseText(staticStyle, options.delimiters);
                          if (res) {
                            warn(
                              "style=\"" + staticStyle + "\": " +
                              'Interpolation inside attributes has been removed. ' +
                              'Use v-bind or the colon shorthand instead. For example, ' +
                              'instead of <div style="{{ val }}">, use <div :style="val">.',
                              el.rawAttrsMap['style']
                            );
                          }
                        }
                        el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
                      }
                  
                      var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
                      if (styleBinding) {
                        el.styleBinding = styleBinding;
                      }
                    }
                  
                    function genData$1 (el) {
                      var data = '';
                      if (el.staticStyle) {
                        data += "staticStyle:" + (el.staticStyle) + ",";
                      }
                      if (el.styleBinding) {
                        data += "style:(" + (el.styleBinding) + "),";
                      }
                      return data
                    }
                  
                    var style$1 = {
                      staticKeys: ['staticStyle'],
                      transformNode: transformNode$1,
                      genData: genData$1
                    };
                  
                    /*  */
                  
                    var decoder;
                  
                    var he = {
                      decode: function decode (html) {
                        decoder = decoder || document.createElement('div');
                        decoder.innerHTML = html;
                        return decoder.textContent
                      }
                    };
                  
                    /*  */
                  
                    var isUnaryTag = makeMap(
                      'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
                      'link,meta,param,source,track,wbr'
                    );
                  
                    // Elements that you can, intentionally, leave open
                    // (and which close themselves)
                    var canBeLeftOpenTag = makeMap(
                      'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
                    );
                  
                    // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
                    // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
                    var isNonPhrasingTag = makeMap(
                      'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
                      'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
                      'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
                      'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
                      'title,tr,track'
                    );
                  
                    /**
                     * Not type-checking this file because it's mostly vendor code.
                     */
                  
                    // Regular Expressions for parsing tags and attributes
                    var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
                    var dynamicArgAttribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
                    var ncname = "[a-zA-Z_][\\-\\.0-9_a-zA-Z" + (unicodeRegExp.source) + "]*";
                    var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
                    var startTagOpen = new RegExp(("^<" + qnameCapture));
                    var startTagClose = /^\s*(\/?)>/;
                    var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
                    var doctype = /^<!DOCTYPE [^>]+>/i;
                    // #7298: escape - to avoid being passed as HTML comment when inlined in page
                    var comment = /^<!\--/;
                    var conditionalComment = /^<!\[/;
                  
                    // Special Elements (can contain anything)
                    var isPlainTextElement = makeMap('script,style,textarea', true);
                    var reCache = {};
                  
                    var decodingMap = {
                      '&lt;': '<',
                      '&gt;': '>',
                      '&quot;': '"',
                      '&amp;': '&',
                      '&#10;': '\n',
                      '&#9;': '\t',
                      '&#39;': "'"
                    };
                    var encodedAttr = /&(?:lt|gt|quot|amp|#39);/g;
                    var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;
                  
                    // #5992
                    var isIgnoreNewlineTag = makeMap('pre,textarea', true);
                    var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };
                  
                    function decodeAttr (value, shouldDecodeNewlines) {
                      var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
                      return value.replace(re, function (match) { return decodingMap[match]; })
                    }
                  
                    function parseHTML (html, options) {
                      var stack = [];
                      var expectHTML = options.expectHTML;
                      var isUnaryTag$$1 = options.isUnaryTag || no;
                      var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
                      var index = 0;
                      var last, lastTag;
                      while (html) {
                        last = html;
                        // Make sure we're not in a plaintext content element like script/style
                        if (!lastTag || !isPlainTextElement(lastTag)) {
                          var textEnd = html.indexOf('<');
                          if (textEnd === 0) {
                            // Comment:
                            if (comment.test(html)) {
                              var commentEnd = html.indexOf('-->');
                  
                              if (commentEnd >= 0) {
                                if (options.shouldKeepComment) {
                                  options.comment(html.substring(4, commentEnd), index, index + commentEnd + 3);
                                }
                                advance(commentEnd + 3);
                                continue
                              }
                            }
                  
                            // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                            if (conditionalComment.test(html)) {
                              var conditionalEnd = html.indexOf(']>');
                  
                              if (conditionalEnd >= 0) {
                                advance(conditionalEnd + 2);
                                continue
                              }
                            }
                  
                            // Doctype:
                            var doctypeMatch = html.match(doctype);
                            if (doctypeMatch) {
                              advance(doctypeMatch[0].length);
                              continue
                            }
                  
                            // End tag:
                            var endTagMatch = html.match(endTag);
                            if (endTagMatch) {
                              var curIndex = index;
                              advance(endTagMatch[0].length);
                              parseEndTag(endTagMatch[1], curIndex, index);
                              continue
                            }
                  
                            // Start tag:
                            var startTagMatch = parseStartTag();
                            if (startTagMatch) {
                              handleStartTag(startTagMatch);
                              if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {
                                advance(1);
                              }
                              continue
                            }
                          }
                  
                          var text = (void 0), rest = (void 0), next = (void 0);
                          if (textEnd >= 0) {
                            rest = html.slice(textEnd);
                            while (
                              !endTag.test(rest) &&
                              !startTagOpen.test(rest) &&
                              !comment.test(rest) &&
                              !conditionalComment.test(rest)
                            ) {
                              // < in plain text, be forgiving and treat it as text
                              next = rest.indexOf('<', 1);
                              if (next < 0) { break }
                              textEnd += next;
                              rest = html.slice(textEnd);
                            }
                            text = html.substring(0, textEnd);
                          }
                  
                          if (textEnd < 0) {
                            text = html;
                          }
                  
                          if (text) {
                            advance(text.length);
                          }
                  
                          if (options.chars && text) {
                            options.chars(text, index - text.length, index);
                          }
                        } else {
                          var endTagLength = 0;
                          var stackedTag = lastTag.toLowerCase();
                          var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
                          var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
                            endTagLength = endTag.length;
                            if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                              text = text
                                .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
                                .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                            }
                            if (shouldIgnoreFirstNewline(stackedTag, text)) {
                              text = text.slice(1);
                            }
                            if (options.chars) {
                              options.chars(text);
                            }
                            return ''
                          });
                          index += html.length - rest$1.length;
                          html = rest$1;
                          parseEndTag(stackedTag, index - endTagLength, index);
                        }
                  
                        if (html === last) {
                          options.chars && options.chars(html);
                          if (!stack.length && options.warn) {
                            options.warn(("Mal-formatted tag at end of template: \"" + html + "\""), { start: index + html.length });
                          }
                          break
                        }
                      }
                  
                      // Clean up any remaining tags
                      parseEndTag();
                  
                      function advance (n) {
                        index += n;
                        html = html.substring(n);
                      }
                  
                      function parseStartTag () {
                        var start = html.match(startTagOpen);
                        if (start) {
                          var match = {
                            tagName: start[1],
                            attrs: [],
                            start: index
                          };
                          advance(start[0].length);
                          var end, attr;
                          while (!(end = html.match(startTagClose)) && (attr = html.match(dynamicArgAttribute) || html.match(attribute))) {
                            attr.start = index;
                            advance(attr[0].length);
                            attr.end = index;
                            match.attrs.push(attr);
                          }
                          if (end) {
                            match.unarySlash = end[1];
                            advance(end[0].length);
                            match.end = index;
                            return match
                          }
                        }
                      }
                  
                      function handleStartTag (match) {
                        var tagName = match.tagName;
                        var unarySlash = match.unarySlash;
                  
                        if (expectHTML) {
                          if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                            parseEndTag(lastTag);
                          }
                          if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                            parseEndTag(tagName);
                          }
                        }
                  
                        var unary = isUnaryTag$$1(tagName) || !!unarySlash;
                  
                        var l = match.attrs.length;
                        var attrs = new Array(l);
                        for (var i = 0; i < l; i++) {
                          var args = match.attrs[i];
                          var value = args[3] || args[4] || args[5] || '';
                          var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
                            ? options.shouldDecodeNewlinesForHref
                            : options.shouldDecodeNewlines;
                          attrs[i] = {
                            name: args[1],
                            value: decodeAttr(value, shouldDecodeNewlines)
                          };
                          if (options.outputSourceRange) {
                            attrs[i].start = args.start + args[0].match(/^\s*/).length;
                            attrs[i].end = args.end;
                          }
                        }
                  
                        if (!unary) {
                          stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs, start: match.start, end: match.end });
                          lastTag = tagName;
                        }
                  
                        if (options.start) {
                          options.start(tagName, attrs, unary, match.start, match.end);
                        }
                      }
                  
                      function parseEndTag (tagName, start, end) {
                        var pos, lowerCasedTagName;
                        if (start == null) { start = index; }
                        if (end == null) { end = index; }
                  
                        // Find the closest opened tag of the same type
                        if (tagName) {
                          lowerCasedTagName = tagName.toLowerCase();
                          for (pos = stack.length - 1; pos >= 0; pos--) {
                            if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                              break
                            }
                          }
                        } else {
                          // If no tag name is provided, clean shop
                          pos = 0;
                        }
                  
                        if (pos >= 0) {
                          // Close all the open elements, up the stack
                          for (var i = stack.length - 1; i >= pos; i--) {
                            if (i > pos || !tagName &&
                              options.warn
                            ) {
                              options.warn(
                                ("tag <" + (stack[i].tag) + "> has no matching end tag."),
                                { start: stack[i].start, end: stack[i].end }
                              );
                            }
                            if (options.end) {
                              options.end(stack[i].tag, start, end);
                            }
                          }
                  
                          // Remove the open elements from the stack
                          stack.length = pos;
                          lastTag = pos && stack[pos - 1].tag;
                        } else if (lowerCasedTagName === 'br') {
                          if (options.start) {
                            options.start(tagName, [], true, start, end);
                          }
                        } else if (lowerCasedTagName === 'p') {
                          if (options.start) {
                            options.start(tagName, [], false, start, end);
                          }
                          if (options.end) {
                            options.end(tagName, start, end);
                          }
                        }
                      }
                    }
                  
                    /*  */
                  
                    var onRE = /^@|^v-on:/;
                    var dirRE = /^v-|^@|^:|^#/;
                    var forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
                    var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
                    var stripParensRE = /^\(|\)$/g;
                    var dynamicArgRE = /^\[.*\]$/;
                  
                    var argRE = /:(.*)$/;
                    var bindRE = /^:|^\.|^v-bind:/;
                    var modifierRE = /\.[^.\]]+(?=[^\]]*$)/g;
                  
                    var slotRE = /^v-slot(:|$)|^#/;
                  
                    var lineBreakRE = /[\r\n]/;
                    var whitespaceRE$1 = /\s+/g;
                  
                    var invalidAttributeRE = /[\s"'<>\/=]/;
                  
                    var decodeHTMLCached = cached(he.decode);
                  
                    var emptySlotScopeToken = "_empty_";
                  
                    // configurable state
                    var warn$2;
                    var delimiters;
                    var transforms;
                    var preTransforms;
                    var postTransforms;
                    var platformIsPreTag;
                    var platformMustUseProp;
                    var platformGetTagNamespace;
                    var maybeComponent;
                  
                    function createASTElement (
                      tag,
                      attrs,
                      parent
                    ) {
                      return {
                        type: 1,
                        tag: tag,
                        attrsList: attrs,
                        attrsMap: makeAttrsMap(attrs),
                        rawAttrsMap: {},
                        parent: parent,
                        children: []
                      }
                    }
                  
                    /**
                     * Convert HTML string to AST.
                     */
                    function parse (
                      template,
                      options
                    ) {
                      warn$2 = options.warn || baseWarn;
                  
                      platformIsPreTag = options.isPreTag || no;
                      platformMustUseProp = options.mustUseProp || no;
                      platformGetTagNamespace = options.getTagNamespace || no;
                      var isReservedTag = options.isReservedTag || no;
                      maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
                  
                      transforms = pluckModuleFunction(options.modules, 'transformNode');
                      preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
                      postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
                  
                      delimiters = options.delimiters;
                  
                      var stack = [];
                      var preserveWhitespace = options.preserveWhitespace !== false;
                      var whitespaceOption = options.whitespace;
                      var root;
                      var currentParent;
                      var inVPre = false;
                      var inPre = false;
                      var warned = false;
                  
                      function warnOnce (msg, range) {
                        if (!warned) {
                          warned = true;
                          warn$2(msg, range);
                        }
                      }
                  
                      function closeElement (element) {
                        trimEndingWhitespace(element);
                        if (!inVPre && !element.processed) {
                          element = processElement(element, options);
                        }
                        // tree management
                        if (!stack.length && element !== root) {
                          // allow root elements with v-if, v-else-if and v-else
                          if (root.if && (element.elseif || element.else)) {
                            {
                              checkRootConstraints(element);
                            }
                            addIfCondition(root, {
                              exp: element.elseif,
                              block: element
                            });
                          } else {
                            warnOnce(
                              "Component template should contain exactly one root element. " +
                              "If you are using v-if on multiple elements, " +
                              "use v-else-if to chain them instead.",
                              { start: element.start }
                            );
                          }
                        }
                        if (currentParent && !element.forbidden) {
                          if (element.elseif || element.else) {
                            processIfConditions(element, currentParent);
                          } else {
                            if (element.slotScope) {
                              // scoped slot
                              // keep it in the children list so that v-else(-if) conditions can
                              // find it as the prev node.
                              var name = element.slotTarget || '"default"'
                              ;(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                            }
                            currentParent.children.push(element);
                            element.parent = currentParent;
                          }
                        }
                  
                        // final children cleanup
                        // filter out scoped slots
                        element.children = element.children.filter(function (c) { return !(c).slotScope; });
                        // remove trailing whitespace node again
                        trimEndingWhitespace(element);
                  
                        // check pre state
                        if (element.pre) {
                          inVPre = false;
                        }
                        if (platformIsPreTag(element.tag)) {
                          inPre = false;
                        }
                        // apply post-transforms
                        for (var i = 0; i < postTransforms.length; i++) {
                          postTransforms[i](element, options);
                        }
                      }
                  
                      function trimEndingWhitespace (el) {
                        // remove trailing whitespace node
                        if (!inPre) {
                          var lastNode;
                          while (
                            (lastNode = el.children[el.children.length - 1]) &&
                            lastNode.type === 3 &&
                            lastNode.text === ' '
                          ) {
                            el.children.pop();
                          }
                        }
                      }
                  
                      function checkRootConstraints (el) {
                        if (el.tag === 'slot' || el.tag === 'template') {
                          warnOnce(
                            "Cannot use <" + (el.tag) + "> as component root element because it may " +
                            'contain multiple nodes.',
                            { start: el.start }
                          );
                        }
                        if (el.attrsMap.hasOwnProperty('v-for')) {
                          warnOnce(
                            'Cannot use v-for on stateful component root element because ' +
                            'it renders multiple elements.',
                            el.rawAttrsMap['v-for']
                          );
                        }
                      }
                  
                      parseHTML(template, {
                        warn: warn$2,
                        expectHTML: options.expectHTML,
                        isUnaryTag: options.isUnaryTag,
                        canBeLeftOpenTag: options.canBeLeftOpenTag,
                        shouldDecodeNewlines: options.shouldDecodeNewlines,
                        shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
                        shouldKeepComment: options.comments,
                        outputSourceRange: options.outputSourceRange,
                        start: function start (tag, attrs, unary, start$1, end) {
                          // check namespace.
                          // inherit parent ns if there is one
                          var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);
                  
                          // handle IE svg bug
                          /* istanbul ignore if */
                          if (isIE && ns === 'svg') {
                            attrs = guardIESVGBug(attrs);
                          }
                  
                          var element = createASTElement(tag, attrs, currentParent);
                          if (ns) {
                            element.ns = ns;
                          }
                  
                          {
                            if (options.outputSourceRange) {
                              element.start = start$1;
                              element.end = end;
                              element.rawAttrsMap = element.attrsList.reduce(function (cumulated, attr) {
                                cumulated[attr.name] = attr;
                                return cumulated
                              }, {});
                            }
                            attrs.forEach(function (attr) {
                              if (invalidAttributeRE.test(attr.name)) {
                                warn$2(
                                  "Invalid dynamic argument expression: attribute names cannot contain " +
                                  "spaces, quotes, <, >, / or =.",
                                  {
                                    start: attr.start + attr.name.indexOf("["),
                                    end: attr.start + attr.name.length
                                  }
                                );
                              }
                            });
                          }
                  
                          if (isForbiddenTag(element) && !isServerRendering()) {
                            element.forbidden = true;
                            warn$2(
                              'Templates should only be responsible for mapping the state to the ' +
                              'UI. Avoid placing tags with side-effects in your templates, such as ' +
                              "<" + tag + ">" + ', as they will not be parsed.',
                              { start: element.start }
                            );
                          }
                  
                          // apply pre-transforms
                          for (var i = 0; i < preTransforms.length; i++) {
                            element = preTransforms[i](element, options) || element;
                          }
                  
                          if (!inVPre) {
                            processPre(element);
                            if (element.pre) {
                              inVPre = true;
                            }
                          }
                          if (platformIsPreTag(element.tag)) {
                            inPre = true;
                          }
                          if (inVPre) {
                            processRawAttrs(element);
                          } else if (!element.processed) {
                            // structural directives
                            processFor(element);
                            processIf(element);
                            processOnce(element);
                          }
                  
                          if (!root) {
                            root = element;
                            {
                              checkRootConstraints(root);
                            }
                          }
                  
                          if (!unary) {
                            currentParent = element;
                            stack.push(element);
                          } else {
                            closeElement(element);
                          }
                        },
                  
                        end: function end (tag, start, end$1) {
                          var element = stack[stack.length - 1];
                          // pop stack
                          stack.length -= 1;
                          currentParent = stack[stack.length - 1];
                          if (options.outputSourceRange) {
                            element.end = end$1;
                          }
                          closeElement(element);
                        },
                  
                        chars: function chars (text, start, end) {
                          if (!currentParent) {
                            {
                              if (text === template) {
                                warnOnce(
                                  'Component template requires a root element, rather than just text.',
                                  { start: start }
                                );
                              } else if ((text = text.trim())) {
                                warnOnce(
                                  ("text \"" + text + "\" outside root element will be ignored."),
                                  { start: start }
                                );
                              }
                            }
                            return
                          }
                          // IE textarea placeholder bug
                          /* istanbul ignore if */
                          if (isIE &&
                            currentParent.tag === 'textarea' &&
                            currentParent.attrsMap.placeholder === text
                          ) {
                            return
                          }
                          var children = currentParent.children;
                          if (inPre || text.trim()) {
                            text = isTextTag(currentParent) ? text : decodeHTMLCached(text);
                          } else if (!children.length) {
                            // remove the whitespace-only node right after an opening tag
                            text = '';
                          } else if (whitespaceOption) {
                            if (whitespaceOption === 'condense') {
                              // in condense mode, remove the whitespace node if it contains
                              // line break, otherwise condense to a single space
                              text = lineBreakRE.test(text) ? '' : ' ';
                            } else {
                              text = ' ';
                            }
                          } else {
                            text = preserveWhitespace ? ' ' : '';
                          }
                          if (text) {
                            if (!inPre && whitespaceOption === 'condense') {
                              // condense consecutive whitespaces into single space
                              text = text.replace(whitespaceRE$1, ' ');
                            }
                            var res;
                            var child;
                            if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
                              child = {
                                type: 2,
                                expression: res.expression,
                                tokens: res.tokens,
                                text: text
                              };
                            } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                              child = {
                                type: 3,
                                text: text
                              };
                            }
                            if (child) {
                              if (options.outputSourceRange) {
                                child.start = start;
                                child.end = end;
                              }
                              children.push(child);
                            }
                          }
                        },
                        comment: function comment (text, start, end) {
                          // adding anyting as a sibling to the root node is forbidden
                          // comments should still be allowed, but ignored
                          if (currentParent) {
                            var child = {
                              type: 3,
                              text: text,
                              isComment: true
                            };
                            if (options.outputSourceRange) {
                              child.start = start;
                              child.end = end;
                            }
                            currentParent.children.push(child);
                          }
                        }
                      });
                      return root
                    }
                  
                    function processPre (el) {
                      if (getAndRemoveAttr(el, 'v-pre') != null) {
                        el.pre = true;
                      }
                    }
                  
                    function processRawAttrs (el) {
                      var list = el.attrsList;
                      var len = list.length;
                      if (len) {
                        var attrs = el.attrs = new Array(len);
                        for (var i = 0; i < len; i++) {
                          attrs[i] = {
                            name: list[i].name,
                            value: JSON.stringify(list[i].value)
                          };
                          if (list[i].start != null) {
                            attrs[i].start = list[i].start;
                            attrs[i].end = list[i].end;
                          }
                        }
                      } else if (!el.pre) {
                        // non root node in pre blocks with no attributes
                        el.plain = true;
                      }
                    }
                  
                    function processElement (
                      element,
                      options
                    ) {
                      processKey(element);
                  
                      // determine whether this is a plain element after
                      // removing structural attributes
                      element.plain = (
                        !element.key &&
                        !element.scopedSlots &&
                        !element.attrsList.length
                      );
                  
                      processRef(element);
                      processSlotContent(element);
                      processSlotOutlet(element);
                      processComponent(element);
                      for (var i = 0; i < transforms.length; i++) {
                        element = transforms[i](element, options) || element;
                      }
                      processAttrs(element);
                      return element
                    }
                  
                    function processKey (el) {
                      var exp = getBindingAttr(el, 'key');
                      if (exp) {
                        {
                          if (el.tag === 'template') {
                            warn$2(
                              "<template> cannot be keyed. Place the key on real elements instead.",
                              getRawBindingAttr(el, 'key')
                            );
                          }
                          if (el.for) {
                            var iterator = el.iterator2 || el.iterator1;
                            var parent = el.parent;
                            if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
                              warn$2(
                                "Do not use v-for index as key on <transition-group> children, " +
                                "this is the same as not using keys.",
                                getRawBindingAttr(el, 'key'),
                                true /* tip */
                              );
                            }
                          }
                        }
                        el.key = exp;
                      }
                    }
                  
                    function processRef (el) {
                      var ref = getBindingAttr(el, 'ref');
                      if (ref) {
                        el.ref = ref;
                        el.refInFor = checkInFor(el);
                      }
                    }
                  
                    function processFor (el) {
                      var exp;
                      if ((exp = getAndRemoveAttr(el, 'v-for'))) {
                        var res = parseFor(exp);
                        if (res) {
                          extend(el, res);
                        } else {
                          warn$2(
                            ("Invalid v-for expression: " + exp),
                            el.rawAttrsMap['v-for']
                          );
                        }
                      }
                    }
                  
                  
                  
                    function parseFor (exp) {
                      var inMatch = exp.match(forAliasRE);
                      if (!inMatch) { return }
                      var res = {};
                      res.for = inMatch[2].trim();
                      var alias = inMatch[1].trim().replace(stripParensRE, '');
                      var iteratorMatch = alias.match(forIteratorRE);
                      if (iteratorMatch) {
                        res.alias = alias.replace(forIteratorRE, '').trim();
                        res.iterator1 = iteratorMatch[1].trim();
                        if (iteratorMatch[2]) {
                          res.iterator2 = iteratorMatch[2].trim();
                        }
                      } else {
                        res.alias = alias;
                      }
                      return res
                    }
                  
                    function processIf (el) {
                      var exp = getAndRemoveAttr(el, 'v-if');
                      if (exp) {
                        el.if = exp;
                        addIfCondition(el, {
                          exp: exp,
                          block: el
                        });
                      } else {
                        if (getAndRemoveAttr(el, 'v-else') != null) {
                          el.else = true;
                        }
                        var elseif = getAndRemoveAttr(el, 'v-else-if');
                        if (elseif) {
                          el.elseif = elseif;
                        }
                      }
                    }
                  
                    function processIfConditions (el, parent) {
                      var prev = findPrevElement(parent.children);
                      if (prev && prev.if) {
                        addIfCondition(prev, {
                          exp: el.elseif,
                          block: el
                        });
                      } else {
                        warn$2(
                          "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
                          "used on element <" + (el.tag) + "> without corresponding v-if.",
                          el.rawAttrsMap[el.elseif ? 'v-else-if' : 'v-else']
                        );
                      }
                    }
                  
                    function findPrevElement (children) {
                      var i = children.length;
                      while (i--) {
                        if (children[i].type === 1) {
                          return children[i]
                        } else {
                          if (children[i].text !== ' ') {
                            warn$2(
                              "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
                              "will be ignored.",
                              children[i]
                            );
                          }
                          children.pop();
                        }
                      }
                    }
                  
                    function addIfCondition (el, condition) {
                      if (!el.ifConditions) {
                        el.ifConditions = [];
                      }
                      el.ifConditions.push(condition);
                    }
                  
                    function processOnce (el) {
                      var once$$1 = getAndRemoveAttr(el, 'v-once');
                      if (once$$1 != null) {
                        el.once = true;
                      }
                    }
                  
                    // handle content being passed to a component as slot,
                    // e.g. <template slot="xxx">, <div slot-scope="xxx">
                    function processSlotContent (el) {
                      var slotScope;
                      if (el.tag === 'template') {
                        slotScope = getAndRemoveAttr(el, 'scope');
                        /* istanbul ignore if */
                        if (slotScope) {
                          warn$2(
                            "the \"scope\" attribute for scoped slots have been deprecated and " +
                            "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
                            "can also be used on plain elements in addition to <template> to " +
                            "denote scoped slots.",
                            el.rawAttrsMap['scope'],
                            true
                          );
                        }
                        el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
                      } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
                        /* istanbul ignore if */
                        if (el.attrsMap['v-for']) {
                          warn$2(
                            "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
                            "(v-for takes higher priority). Use a wrapper <template> for the " +
                            "scoped slot to make it clearer.",
                            el.rawAttrsMap['slot-scope'],
                            true
                          );
                        }
                        el.slotScope = slotScope;
                      }
                  
                      // slot="xxx"
                      var slotTarget = getBindingAttr(el, 'slot');
                      if (slotTarget) {
                        el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
                        el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
                        // preserve slot as an attribute for native shadow DOM compat
                        // only for non-scoped slots.
                        if (el.tag !== 'template' && !el.slotScope) {
                          addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
                        }
                      }
                  
                      // 2.6 v-slot syntax
                      {
                        if (el.tag === 'template') {
                          // v-slot on <template>
                          var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
                          if (slotBinding) {
                            {
                              if (el.slotTarget || el.slotScope) {
                                warn$2(
                                  "Unexpected mixed usage of different slot syntaxes.",
                                  el
                                );
                              }
                              if (el.parent && !maybeComponent(el.parent)) {
                                warn$2(
                                  "<template v-slot> can only appear at the root level inside " +
                                  "the receiving component",
                                  el
                                );
                              }
                            }
                            var ref = getSlotName(slotBinding);
                            var name = ref.name;
                            var dynamic = ref.dynamic;
                            el.slotTarget = name;
                            el.slotTargetDynamic = dynamic;
                            el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
                          }
                        } else {
                          // v-slot on component, denotes default slot
                          var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
                          if (slotBinding$1) {
                            {
                              if (!maybeComponent(el)) {
                                warn$2(
                                  "v-slot can only be used on components or <template>.",
                                  slotBinding$1
                                );
                              }
                              if (el.slotScope || el.slotTarget) {
                                warn$2(
                                  "Unexpected mixed usage of different slot syntaxes.",
                                  el
                                );
                              }
                              if (el.scopedSlots) {
                                warn$2(
                                  "To avoid scope ambiguity, the default slot should also use " +
                                  "<template> syntax when there are other named slots.",
                                  slotBinding$1
                                );
                              }
                            }
                            // add the component's children to its default slot
                            var slots = el.scopedSlots || (el.scopedSlots = {});
                            var ref$1 = getSlotName(slotBinding$1);
                            var name$1 = ref$1.name;
                            var dynamic$1 = ref$1.dynamic;
                            var slotContainer = slots[name$1] = createASTElement('template', [], el);
                            slotContainer.slotTarget = name$1;
                            slotContainer.slotTargetDynamic = dynamic$1;
                            slotContainer.children = el.children.filter(function (c) {
                              if (!c.slotScope) {
                                c.parent = slotContainer;
                                return true
                              }
                            });
                            slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
                            // remove children as they are returned from scopedSlots now
                            el.children = [];
                            // mark el non-plain so data gets generated
                            el.plain = false;
                          }
                        }
                      }
                    }
                  
                    function getSlotName (binding) {
                      var name = binding.name.replace(slotRE, '');
                      if (!name) {
                        if (binding.name[0] !== '#') {
                          name = 'default';
                        } else {
                          warn$2(
                            "v-slot shorthand syntax requires a slot name.",
                            binding
                          );
                        }
                      }
                      return dynamicArgRE.test(name)
                        // dynamic [name]
                        ? { name: name.slice(1, -1), dynamic: true }
                        // static name
                        : { name: ("\"" + name + "\""), dynamic: false }
                    }
                  
                    // handle <slot/> outlets
                    function processSlotOutlet (el) {
                      if (el.tag === 'slot') {
                        el.slotName = getBindingAttr(el, 'name');
                        if (el.key) {
                          warn$2(
                            "`key` does not work on <slot> because slots are abstract outlets " +
                            "and can possibly expand into multiple elements. " +
                            "Use the key on a wrapping element instead.",
                            getRawBindingAttr(el, 'key')
                          );
                        }
                      }
                    }
                  
                    function processComponent (el) {
                      var binding;
                      if ((binding = getBindingAttr(el, 'is'))) {
                        el.component = binding;
                      }
                      if (getAndRemoveAttr(el, 'inline-template') != null) {
                        el.inlineTemplate = true;
                      }
                    }
                  
                    function processAttrs (el) {
                      var list = el.attrsList;
                      var i, l, name, rawName, value, modifiers, syncGen, isDynamic;
                      for (i = 0, l = list.length; i < l; i++) {
                        name = rawName = list[i].name;
                        value = list[i].value;
                        if (dirRE.test(name)) {
                          // mark element as dynamic
                          el.hasBindings = true;
                          // modifiers
                          modifiers = parseModifiers(name.replace(dirRE, ''));
                          // support .foo shorthand syntax for the .prop modifier
                          if (modifiers) {
                            name = name.replace(modifierRE, '');
                          }
                          if (bindRE.test(name)) { // v-bind
                            name = name.replace(bindRE, '');
                            value = parseFilters(value);
                            isDynamic = dynamicArgRE.test(name);
                            if (isDynamic) {
                              name = name.slice(1, -1);
                            }
                            if (
                              value.trim().length === 0
                            ) {
                              warn$2(
                                ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\"")
                              );
                            }
                            if (modifiers) {
                              if (modifiers.prop && !isDynamic) {
                                name = camelize(name);
                                if (name === 'innerHtml') { name = 'innerHTML'; }
                              }
                              if (modifiers.camel && !isDynamic) {
                                name = camelize(name);
                              }
                              if (modifiers.sync) {
                                syncGen = genAssignmentCode(value, "$event");
                                if (!isDynamic) {
                                  addHandler(
                                    el,
                                    ("update:" + (camelize(name))),
                                    syncGen,
                                    null,
                                    false,
                                    warn$2,
                                    list[i]
                                  );
                                  if (hyphenate(name) !== camelize(name)) {
                                    addHandler(
                                      el,
                                      ("update:" + (hyphenate(name))),
                                      syncGen,
                                      null,
                                      false,
                                      warn$2,
                                      list[i]
                                    );
                                  }
                                } else {
                                  // handler w/ dynamic event name
                                  addHandler(
                                    el,
                                    ("\"update:\"+(" + name + ")"),
                                    syncGen,
                                    null,
                                    false,
                                    warn$2,
                                    list[i],
                                    true // dynamic
                                  );
                                }
                              }
                            }
                            if ((modifiers && modifiers.prop) || (
                              !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
                            )) {
                              addProp(el, name, value, list[i], isDynamic);
                            } else {
                              addAttr(el, name, value, list[i], isDynamic);
                            }
                          } else if (onRE.test(name)) { // v-on
                            name = name.replace(onRE, '');
                            isDynamic = dynamicArgRE.test(name);
                            if (isDynamic) {
                              name = name.slice(1, -1);
                            }
                            addHandler(el, name, value, modifiers, false, warn$2, list[i], isDynamic);
                          } else { // normal directives
                            name = name.replace(dirRE, '');
                            // parse arg
                            var argMatch = name.match(argRE);
                            var arg = argMatch && argMatch[1];
                            isDynamic = false;
                            if (arg) {
                              name = name.slice(0, -(arg.length + 1));
                              if (dynamicArgRE.test(arg)) {
                                arg = arg.slice(1, -1);
                                isDynamic = true;
                              }
                            }
                            addDirective(el, name, rawName, value, arg, isDynamic, modifiers, list[i]);
                            if (name === 'model') {
                              checkForAliasModel(el, value);
                            }
                          }
                        } else {
                          // literal attribute
                          {
                            var res = parseText(value, delimiters);
                            if (res) {
                              warn$2(
                                name + "=\"" + value + "\": " +
                                'Interpolation inside attributes has been removed. ' +
                                'Use v-bind or the colon shorthand instead. For example, ' +
                                'instead of <div id="{{ val }}">, use <div :id="val">.',
                                list[i]
                              );
                            }
                          }
                          addAttr(el, name, JSON.stringify(value), list[i]);
                          // #6887 firefox doesn't update muted state if set via attribute
                          // even immediately after element creation
                          if (!el.component &&
                              name === 'muted' &&
                              platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                            addProp(el, name, 'true', list[i]);
                          }
                        }
                      }
                    }
                  
                    function checkInFor (el) {
                      var parent = el;
                      while (parent) {
                        if (parent.for !== undefined) {
                          return true
                        }
                        parent = parent.parent;
                      }
                      return false
                    }
                  
                    function parseModifiers (name) {
                      var match = name.match(modifierRE);
                      if (match) {
                        var ret = {};
                        match.forEach(function (m) { ret[m.slice(1)] = true; });
                        return ret
                      }
                    }
                  
                    function makeAttrsMap (attrs) {
                      var map = {};
                      for (var i = 0, l = attrs.length; i < l; i++) {
                        if (
                          map[attrs[i].name] && !isIE && !isEdge
                        ) {
                          warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
                        }
                        map[attrs[i].name] = attrs[i].value;
                      }
                      return map
                    }
                  
                    // for script (e.g. type="x/template") or style, do not decode content
                    function isTextTag (el) {
                      return el.tag === 'script' || el.tag === 'style'
                    }
                  
                    function isForbiddenTag (el) {
                      return (
                        el.tag === 'style' ||
                        (el.tag === 'script' && (
                          !el.attrsMap.type ||
                          el.attrsMap.type === 'text/javascript'
                        ))
                      )
                    }
                  
                    var ieNSBug = /^xmlns:NS\d+/;
                    var ieNSPrefix = /^NS\d+:/;
                  
                    /* istanbul ignore next */
                    function guardIESVGBug (attrs) {
                      var res = [];
                      for (var i = 0; i < attrs.length; i++) {
                        var attr = attrs[i];
                        if (!ieNSBug.test(attr.name)) {
                          attr.name = attr.name.replace(ieNSPrefix, '');
                          res.push(attr);
                        }
                      }
                      return res
                    }
                  
                    function checkForAliasModel (el, value) {
                      var _el = el;
                      while (_el) {
                        if (_el.for && _el.alias === value) {
                          warn$2(
                            "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                            "You are binding v-model directly to a v-for iteration alias. " +
                            "This will not be able to modify the v-for source array because " +
                            "writing to the alias is like modifying a function local variable. " +
                            "Consider using an array of objects and use v-model on an object property instead.",
                            el.rawAttrsMap['v-model']
                          );
                        }
                        _el = _el.parent;
                      }
                    }
                  
                    /*  */
                  
                    function preTransformNode (el, options) {
                      if (el.tag === 'input') {
                        var map = el.attrsMap;
                        if (!map['v-model']) {
                          return
                        }
                  
                        var typeBinding;
                        if (map[':type'] || map['v-bind:type']) {
                          typeBinding = getBindingAttr(el, 'type');
                        }
                        if (!map.type && !typeBinding && map['v-bind']) {
                          typeBinding = "(" + (map['v-bind']) + ").type";
                        }
                  
                        if (typeBinding) {
                          var ifCondition = getAndRemoveAttr(el, 'v-if', true);
                          var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
                          var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
                          var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
                          // 1. checkbox
                          var branch0 = cloneASTElement(el);
                          // process for on the main node
                          processFor(branch0);
                          addRawAttr(branch0, 'type', 'checkbox');
                          processElement(branch0, options);
                          branch0.processed = true; // prevent it from double-processed
                          branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
                          addIfCondition(branch0, {
                            exp: branch0.if,
                            block: branch0
                          });
                          // 2. add radio else-if condition
                          var branch1 = cloneASTElement(el);
                          getAndRemoveAttr(branch1, 'v-for', true);
                          addRawAttr(branch1, 'type', 'radio');
                          processElement(branch1, options);
                          addIfCondition(branch0, {
                            exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
                            block: branch1
                          });
                          // 3. other
                          var branch2 = cloneASTElement(el);
                          getAndRemoveAttr(branch2, 'v-for', true);
                          addRawAttr(branch2, ':type', typeBinding);
                          processElement(branch2, options);
                          addIfCondition(branch0, {
                            exp: ifCondition,
                            block: branch2
                          });
                  
                          if (hasElse) {
                            branch0.else = true;
                          } else if (elseIfCondition) {
                            branch0.elseif = elseIfCondition;
                          }
                  
                          return branch0
                        }
                      }
                    }
                  
                    function cloneASTElement (el) {
                      return createASTElement(el.tag, el.attrsList.slice(), el.parent)
                    }
                  
                    var model$1 = {
                      preTransformNode: preTransformNode
                    };
                  
                    var modules$1 = [
                      klass$1,
                      style$1,
                      model$1
                    ];
                  
                    /*  */
                  
                    function text (el, dir) {
                      if (dir.value) {
                        addProp(el, 'textContent', ("_s(" + (dir.value) + ")"), dir);
                      }
                    }
                  
                    /*  */
                  
                    function html (el, dir) {
                      if (dir.value) {
                        addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"), dir);
                      }
                    }
                  
                    var directives$1 = {
                      model: model,
                      text: text,
                      html: html
                    };
                  
                    /*  */
                  
                    var baseOptions = {
                      expectHTML: true,
                      modules: modules$1,
                      directives: directives$1,
                      isPreTag: isPreTag,
                      isUnaryTag: isUnaryTag,
                      mustUseProp: mustUseProp,
                      canBeLeftOpenTag: canBeLeftOpenTag,
                      isReservedTag: isReservedTag,
                      getTagNamespace: getTagNamespace,
                      staticKeys: genStaticKeys(modules$1)
                    };
                  
                    /*  */
                  
                    var isStaticKey;
                    var isPlatformReservedTag;
                  
                    var genStaticKeysCached = cached(genStaticKeys$1);
                  
                    /**
                     * Goal of the optimizer: walk the generated template AST tree
                     * and detect sub-trees that are purely static, i.e. parts of
                     * the DOM that never needs to change.
                     *
                     * Once we detect these sub-trees, we can:
                     *
                     * 1. Hoist them into constants, so that we no longer need to
                     *    create fresh nodes for them on each re-render;
                     * 2. Completely skip them in the patching process.
                     */
                    function optimize (root, options) {
                      if (!root) { return }
                      isStaticKey = genStaticKeysCached(options.staticKeys || '');
                      isPlatformReservedTag = options.isReservedTag || no;
                      // first pass: mark all non-static nodes.
                      markStatic$1(root);
                      // second pass: mark static roots.
                      markStaticRoots(root, false);
                    }
                  
                    function genStaticKeys$1 (keys) {
                      return makeMap(
                        'type,tag,attrsList,attrsMap,plain,parent,children,attrs,start,end,rawAttrsMap' +
                        (keys ? ',' + keys : '')
                      )
                    }
                  
                    function markStatic$1 (node) {
                      node.static = isStatic(node);
                      if (node.type === 1) {
                        // do not make component slot content static. this avoids
                        // 1. components not able to mutate slot nodes
                        // 2. static slot content fails for hot-reloading
                        if (
                          !isPlatformReservedTag(node.tag) &&
                          node.tag !== 'slot' &&
                          node.attrsMap['inline-template'] == null
                        ) {
                          return
                        }
                        for (var i = 0, l = node.children.length; i < l; i++) {
                          var child = node.children[i];
                          markStatic$1(child);
                          if (!child.static) {
                            node.static = false;
                          }
                        }
                        if (node.ifConditions) {
                          for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                            var block = node.ifConditions[i$1].block;
                            markStatic$1(block);
                            if (!block.static) {
                              node.static = false;
                            }
                          }
                        }
                      }
                    }
                  
                    function markStaticRoots (node, isInFor) {
                      if (node.type === 1) {
                        if (node.static || node.once) {
                          node.staticInFor = isInFor;
                        }
                        // For a node to qualify as a static root, it should have children that
                        // are not just static text. Otherwise the cost of hoisting out will
                        // outweigh the benefits and it's better off to just always render it fresh.
                        if (node.static && node.children.length && !(
                          node.children.length === 1 &&
                          node.children[0].type === 3
                        )) {
                          node.staticRoot = true;
                          return
                        } else {
                          node.staticRoot = false;
                        }
                        if (node.children) {
                          for (var i = 0, l = node.children.length; i < l; i++) {
                            markStaticRoots(node.children[i], isInFor || !!node.for);
                          }
                        }
                        if (node.ifConditions) {
                          for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                            markStaticRoots(node.ifConditions[i$1].block, isInFor);
                          }
                        }
                      }
                    }
                  
                    function isStatic (node) {
                      if (node.type === 2) { // expression
                        return false
                      }
                      if (node.type === 3) { // text
                        return true
                      }
                      return !!(node.pre || (
                        !node.hasBindings && // no dynamic bindings
                        !node.if && !node.for && // not v-if or v-for or v-else
                        !isBuiltInTag(node.tag) && // not a built-in
                        isPlatformReservedTag(node.tag) && // not a component
                        !isDirectChildOfTemplateFor(node) &&
                        Object.keys(node).every(isStaticKey)
                      ))
                    }
                  
                    function isDirectChildOfTemplateFor (node) {
                      while (node.parent) {
                        node = node.parent;
                        if (node.tag !== 'template') {
                          return false
                        }
                        if (node.for) {
                          return true
                        }
                      }
                      return false
                    }
                  
                    /*  */
                  
                    var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function(?:\s+[\w$]+)?\s*\(/;
                    var fnInvokeRE = /\([^)]*?\);*$/;
                    var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;
                  
                    // KeyboardEvent.keyCode aliases
                    var keyCodes = {
                      esc: 27,
                      tab: 9,
                      enter: 13,
                      space: 32,
                      up: 38,
                      left: 37,
                      right: 39,
                      down: 40,
                      'delete': [8, 46]
                    };
                  
                    // KeyboardEvent.key aliases
                    var keyNames = {
                      // #7880: IE11 and Edge use `Esc` for Escape key name.
                      esc: ['Esc', 'Escape'],
                      tab: 'Tab',
                      enter: 'Enter',
                      // #9112: IE11 uses `Spacebar` for Space key name.
                      space: [' ', 'Spacebar'],
                      // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
                      up: ['Up', 'ArrowUp'],
                      left: ['Left', 'ArrowLeft'],
                      right: ['Right', 'ArrowRight'],
                      down: ['Down', 'ArrowDown'],
                      // #9112: IE11 uses `Del` for Delete key name.
                      'delete': ['Backspace', 'Delete', 'Del']
                    };
                  
                    // #4868: modifiers that prevent the execution of the listener
                    // need to explicitly return null so that we can determine whether to remove
                    // the listener for .once
                    var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };
                  
                    var modifierCode = {
                      stop: '$event.stopPropagation();',
                      prevent: '$event.preventDefault();',
                      self: genGuard("$event.target !== $event.currentTarget"),
                      ctrl: genGuard("!$event.ctrlKey"),
                      shift: genGuard("!$event.shiftKey"),
                      alt: genGuard("!$event.altKey"),
                      meta: genGuard("!$event.metaKey"),
                      left: genGuard("'button' in $event && $event.button !== 0"),
                      middle: genGuard("'button' in $event && $event.button !== 1"),
                      right: genGuard("'button' in $event && $event.button !== 2")
                    };
                  
                    function genHandlers (
                      events,
                      isNative
                    ) {
                      var prefix = isNative ? 'nativeOn:' : 'on:';
                      var staticHandlers = "";
                      var dynamicHandlers = "";
                      for (var name in events) {
                        var handlerCode = genHandler(events[name]);
                        if (events[name] && events[name].dynamic) {
                          dynamicHandlers += name + "," + handlerCode + ",";
                        } else {
                          staticHandlers += "\"" + name + "\":" + handlerCode + ",";
                        }
                      }
                      staticHandlers = "{" + (staticHandlers.slice(0, -1)) + "}";
                      if (dynamicHandlers) {
                        return prefix + "_d(" + staticHandlers + ",[" + (dynamicHandlers.slice(0, -1)) + "])"
                      } else {
                        return prefix + staticHandlers
                      }
                    }
                  
                    function genHandler (handler) {
                      if (!handler) {
                        return 'function(){}'
                      }
                  
                      if (Array.isArray(handler)) {
                        return ("[" + (handler.map(function (handler) { return genHandler(handler); }).join(',')) + "]")
                      }
                  
                      var isMethodPath = simplePathRE.test(handler.value);
                      var isFunctionExpression = fnExpRE.test(handler.value);
                      var isFunctionInvocation = simplePathRE.test(handler.value.replace(fnInvokeRE, ''));
                  
                      if (!handler.modifiers) {
                        if (isMethodPath || isFunctionExpression) {
                          return handler.value
                        }
                        return ("function($event){" + (isFunctionInvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline statement
                      } else {
                        var code = '';
                        var genModifierCode = '';
                        var keys = [];
                        for (var key in handler.modifiers) {
                          if (modifierCode[key]) {
                            genModifierCode += modifierCode[key];
                            // left/right
                            if (keyCodes[key]) {
                              keys.push(key);
                            }
                          } else if (key === 'exact') {
                            var modifiers = (handler.modifiers);
                            genModifierCode += genGuard(
                              ['ctrl', 'shift', 'alt', 'meta']
                                .filter(function (keyModifier) { return !modifiers[keyModifier]; })
                                .map(function (keyModifier) { return ("$event." + keyModifier + "Key"); })
                                .join('||')
                            );
                          } else {
                            keys.push(key);
                          }
                        }
                        if (keys.length) {
                          code += genKeyFilter(keys);
                        }
                        // Make sure modifiers like prevent and stop get executed after key filtering
                        if (genModifierCode) {
                          code += genModifierCode;
                        }
                        var handlerCode = isMethodPath
                          ? ("return " + (handler.value) + "($event)")
                          : isFunctionExpression
                            ? ("return (" + (handler.value) + ")($event)")
                            : isFunctionInvocation
                              ? ("return " + (handler.value))
                              : handler.value;
                        return ("function($event){" + code + handlerCode + "}")
                      }
                    }
                  
                    function genKeyFilter (keys) {
                      return (
                        // make sure the key filters only apply to KeyboardEvents
                        // #9441: can't use 'keyCode' in $event because Chrome autofill fires fake
                        // key events that do not have keyCode property...
                        "if(!$event.type.indexOf('key')&&" +
                        (keys.map(genFilterCode).join('&&')) + ")return null;"
                      )
                    }
                  
                    function genFilterCode (key) {
                      var keyVal = parseInt(key, 10);
                      if (keyVal) {
                        return ("$event.keyCode!==" + keyVal)
                      }
                      var keyCode = keyCodes[key];
                      var keyName = keyNames[key];
                      return (
                        "_k($event.keyCode," +
                        (JSON.stringify(key)) + "," +
                        (JSON.stringify(keyCode)) + "," +
                        "$event.key," +
                        "" + (JSON.stringify(keyName)) +
                        ")"
                      )
                    }
                  
                    /*  */
                  
                    function on (el, dir) {
                      if (dir.modifiers) {
                        warn("v-on without argument does not support modifiers.");
                      }
                      el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
                    }
                  
                    /*  */
                  
                    function bind$1 (el, dir) {
                      el.wrapData = function (code) {
                        return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
                      };
                    }
                  
                    /*  */
                  
                    var baseDirectives = {
                      on: on,
                      bind: bind$1,
                      cloak: noop
                    };
                  
                    /*  */
                  
                  
                  
                  
                  
                    var CodegenState = function CodegenState (options) {
                      this.options = options;
                      this.warn = options.warn || baseWarn;
                      this.transforms = pluckModuleFunction(options.modules, 'transformCode');
                      this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
                      this.directives = extend(extend({}, baseDirectives), options.directives);
                      var isReservedTag = options.isReservedTag || no;
                      this.maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
                      this.onceId = 0;
                      this.staticRenderFns = [];
                      this.pre = false;
                    };
                  
                  
                  
                    function generate (
                      ast,
                      options
                    ) {
                      var state = new CodegenState(options);
                      var code = ast ? genElement(ast, state) : '_c("div")';
                      return {
                        render: ("with(this){return " + code + "}"),
                        staticRenderFns: state.staticRenderFns
                      }
                    }
                  
                    function genElement (el, state) {
                      if (el.parent) {
                        el.pre = el.pre || el.parent.pre;
                      }
                  
                      if (el.staticRoot && !el.staticProcessed) {
                        return genStatic(el, state)
                      } else if (el.once && !el.onceProcessed) {
                        return genOnce(el, state)
                      } else if (el.for && !el.forProcessed) {
                        return genFor(el, state)
                      } else if (el.if && !el.ifProcessed) {
                        return genIf(el, state)
                      } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
                        return genChildren(el, state) || 'void 0'
                      } else if (el.tag === 'slot') {
                        return genSlot(el, state)
                      } else {
                        // component or element
                        var code;
                        if (el.component) {
                          code = genComponent(el.component, el, state);
                        } else {
                          var data;
                          if (!el.plain || (el.pre && state.maybeComponent(el))) {
                            data = genData$2(el, state);
                          }
                  
                          var children = el.inlineTemplate ? null : genChildren(el, state, true);
                          code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
                        }
                        // module transforms
                        for (var i = 0; i < state.transforms.length; i++) {
                          code = state.transforms[i](el, code);
                        }
                        return code
                      }
                    }
                  
                    // hoist static sub-trees out
                    function genStatic (el, state) {
                      el.staticProcessed = true;
                      // Some elements (templates) need to behave differently inside of a v-pre
                      // node.  All pre nodes are static roots, so we can use this as a location to
                      // wrap a state change and reset it upon exiting the pre node.
                      var originalPreState = state.pre;
                      if (el.pre) {
                        state.pre = el.pre;
                      }
                      state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
                      state.pre = originalPreState;
                      return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
                    }
                  
                    // v-once
                    function genOnce (el, state) {
                      el.onceProcessed = true;
                      if (el.if && !el.ifProcessed) {
                        return genIf(el, state)
                      } else if (el.staticInFor) {
                        var key = '';
                        var parent = el.parent;
                        while (parent) {
                          if (parent.for) {
                            key = parent.key;
                            break
                          }
                          parent = parent.parent;
                        }
                        if (!key) {
                          state.warn(
                            "v-once can only be used inside v-for that is keyed. ",
                            el.rawAttrsMap['v-once']
                          );
                          return genElement(el, state)
                        }
                        return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
                      } else {
                        return genStatic(el, state)
                      }
                    }
                  
                    function genIf (
                      el,
                      state,
                      altGen,
                      altEmpty
                    ) {
                      el.ifProcessed = true; // avoid recursion
                      return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
                    }
                  
                    function genIfConditions (
                      conditions,
                      state,
                      altGen,
                      altEmpty
                    ) {
                      if (!conditions.length) {
                        return altEmpty || '_e()'
                      }
                  
                      var condition = conditions.shift();
                      if (condition.exp) {
                        return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
                      } else {
                        return ("" + (genTernaryExp(condition.block)))
                      }
                  
                      // v-if with v-once should generate code like (a)?_m(0):_m(1)
                      function genTernaryExp (el) {
                        return altGen
                          ? altGen(el, state)
                          : el.once
                            ? genOnce(el, state)
                            : genElement(el, state)
                      }
                    }
                  
                    function genFor (
                      el,
                      state,
                      altGen,
                      altHelper
                    ) {
                      var exp = el.for;
                      var alias = el.alias;
                      var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
                      var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
                  
                      if (state.maybeComponent(el) &&
                        el.tag !== 'slot' &&
                        el.tag !== 'template' &&
                        !el.key
                      ) {
                        state.warn(
                          "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
                          "v-for should have explicit keys. " +
                          "See https://vuejs.org/guide/list.html#key for more info.",
                          el.rawAttrsMap['v-for'],
                          true /* tip */
                        );
                      }
                  
                      el.forProcessed = true; // avoid recursion
                      return (altHelper || '_l') + "((" + exp + ")," +
                        "function(" + alias + iterator1 + iterator2 + "){" +
                          "return " + ((altGen || genElement)(el, state)) +
                        '})'
                    }
                  
                    function genData$2 (el, state) {
                      var data = '{';
                  
                      // directives first.
                      // directives may mutate the el's other properties before they are generated.
                      var dirs = genDirectives(el, state);
                      if (dirs) { data += dirs + ','; }
                  
                      // key
                      if (el.key) {
                        data += "key:" + (el.key) + ",";
                      }
                      // ref
                      if (el.ref) {
                        data += "ref:" + (el.ref) + ",";
                      }
                      if (el.refInFor) {
                        data += "refInFor:true,";
                      }
                      // pre
                      if (el.pre) {
                        data += "pre:true,";
                      }
                      // record original tag name for components using "is" attribute
                      if (el.component) {
                        data += "tag:\"" + (el.tag) + "\",";
                      }
                      // module data generation functions
                      for (var i = 0; i < state.dataGenFns.length; i++) {
                        data += state.dataGenFns[i](el);
                      }
                      // attributes
                      if (el.attrs) {
                        data += "attrs:" + (genProps(el.attrs)) + ",";
                      }
                      // DOM props
                      if (el.props) {
                        data += "domProps:" + (genProps(el.props)) + ",";
                      }
                      // event handlers
                      if (el.events) {
                        data += (genHandlers(el.events, false)) + ",";
                      }
                      if (el.nativeEvents) {
                        data += (genHandlers(el.nativeEvents, true)) + ",";
                      }
                      // slot target
                      // only for non-scoped slots
                      if (el.slotTarget && !el.slotScope) {
                        data += "slot:" + (el.slotTarget) + ",";
                      }
                      // scoped slots
                      if (el.scopedSlots) {
                        data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
                      }
                      // component v-model
                      if (el.model) {
                        data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
                      }
                      // inline-template
                      if (el.inlineTemplate) {
                        var inlineTemplate = genInlineTemplate(el, state);
                        if (inlineTemplate) {
                          data += inlineTemplate + ",";
                        }
                      }
                      data = data.replace(/,$/, '') + '}';
                      // v-bind dynamic argument wrap
                      // v-bind with dynamic arguments must be applied using the same v-bind object
                      // merge helper so that class/style/mustUseProp attrs are handled correctly.
                      if (el.dynamicAttrs) {
                        data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genProps(el.dynamicAttrs)) + ")";
                      }
                      // v-bind data wrap
                      if (el.wrapData) {
                        data = el.wrapData(data);
                      }
                      // v-on data wrap
                      if (el.wrapListeners) {
                        data = el.wrapListeners(data);
                      }
                      return data
                    }
                  
                    function genDirectives (el, state) {
                      var dirs = el.directives;
                      if (!dirs) { return }
                      var res = 'directives:[';
                      var hasRuntime = false;
                      var i, l, dir, needRuntime;
                      for (i = 0, l = dirs.length; i < l; i++) {
                        dir = dirs[i];
                        needRuntime = true;
                        var gen = state.directives[dir.name];
                        if (gen) {
                          // compile-time directive that manipulates AST.
                          // returns true if it also needs a runtime counterpart.
                          needRuntime = !!gen(el, dir, state.warn);
                        }
                        if (needRuntime) {
                          hasRuntime = true;
                          res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:" + (dir.isDynamicArg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
                        }
                      }
                      if (hasRuntime) {
                        return res.slice(0, -1) + ']'
                      }
                    }
                  
                    function genInlineTemplate (el, state) {
                      var ast = el.children[0];
                      if (el.children.length !== 1 || ast.type !== 1) {
                        state.warn(
                          'Inline-template components must have exactly one child element.',
                          { start: el.start }
                        );
                      }
                      if (ast && ast.type === 1) {
                        var inlineRenderFns = generate(ast, state.options);
                        return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
                      }
                    }
                  
                    function genScopedSlots (
                      el,
                      slots,
                      state
                    ) {
                      // by default scoped slots are considered "stable", this allows child
                      // components with only scoped slots to skip forced updates from parent.
                      // but in some cases we have to bail-out of this optimization
                      // for example if the slot contains dynamic names, has v-if or v-for on them...
                      var needsForceUpdate = el.for || Object.keys(slots).some(function (key) {
                        var slot = slots[key];
                        return (
                          slot.slotTargetDynamic ||
                          slot.if ||
                          slot.for ||
                          containsSlotChild(slot) // is passing down slot from parent which may be dynamic
                        )
                      });
                  
                      // #9534: if a component with scoped slots is inside a conditional branch,
                      // it's possible for the same component to be reused but with different
                      // compiled slot content. To avoid that, we generate a unique key based on
                      // the generated code of all the slot contents.
                      var needsKey = !!el.if;
                  
                      // OR when it is inside another scoped slot or v-for (the reactivity may be
                      // disconnected due to the intermediate scope variable)
                      // #9438, #9506
                      // TODO: this can be further optimized by properly analyzing in-scope bindings
                      // and skip force updating ones that do not actually use scope variables.
                      if (!needsForceUpdate) {
                        var parent = el.parent;
                        while (parent) {
                          if (
                            (parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
                            parent.for
                          ) {
                            needsForceUpdate = true;
                            break
                          }
                          if (parent.if) {
                            needsKey = true;
                          }
                          parent = parent.parent;
                        }
                      }
                  
                      var generatedSlots = Object.keys(slots)
                        .map(function (key) { return genScopedSlot(slots[key], state); })
                        .join(',');
                  
                      return ("scopedSlots:_u([" + generatedSlots + "]" + (needsForceUpdate ? ",null,true" : "") + (!needsForceUpdate && needsKey ? (",null,false," + (hash(generatedSlots))) : "") + ")")
                    }
                  
                    function hash(str) {
                      var hash = 5381;
                      var i = str.length;
                      while(i) {
                        hash = (hash * 33) ^ str.charCodeAt(--i);
                      }
                      return hash >>> 0
                    }
                  
                    function containsSlotChild (el) {
                      if (el.type === 1) {
                        if (el.tag === 'slot') {
                          return true
                        }
                        return el.children.some(containsSlotChild)
                      }
                      return false
                    }
                  
                    function genScopedSlot (
                      el,
                      state
                    ) {
                      var isLegacySyntax = el.attrsMap['slot-scope'];
                      if (el.if && !el.ifProcessed && !isLegacySyntax) {
                        return genIf(el, state, genScopedSlot, "null")
                      }
                      if (el.for && !el.forProcessed) {
                        return genFor(el, state, genScopedSlot)
                      }
                      var slotScope = el.slotScope === emptySlotScopeToken
                        ? ""
                        : String(el.slotScope);
                      var fn = "function(" + slotScope + "){" +
                        "return " + (el.tag === 'template'
                          ? el.if && isLegacySyntax
                            ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
                            : genChildren(el, state) || 'undefined'
                          : genElement(el, state)) + "}";
                      // reverse proxy v-slot without scope on this.$slots
                      var reverseProxy = slotScope ? "" : ",proxy:true";
                      return ("{key:" + (el.slotTarget || "\"default\"") + ",fn:" + fn + reverseProxy + "}")
                    }
                  
                    function genChildren (
                      el,
                      state,
                      checkSkip,
                      altGenElement,
                      altGenNode
                    ) {
                      var children = el.children;
                      if (children.length) {
                        var el$1 = children[0];
                        // optimize single v-for
                        if (children.length === 1 &&
                          el$1.for &&
                          el$1.tag !== 'template' &&
                          el$1.tag !== 'slot'
                        ) {
                          var normalizationType = checkSkip
                            ? state.maybeComponent(el$1) ? ",1" : ",0"
                            : "";
                          return ("" + ((altGenElement || genElement)(el$1, state)) + normalizationType)
                        }
                        var normalizationType$1 = checkSkip
                          ? getNormalizationType(children, state.maybeComponent)
                          : 0;
                        var gen = altGenNode || genNode;
                        return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType$1 ? ("," + normalizationType$1) : ''))
                      }
                    }
                  
                    // determine the normalization needed for the children array.
                    // 0: no normalization needed
                    // 1: simple normalization needed (possible 1-level deep nested array)
                    // 2: full normalization needed
                    function getNormalizationType (
                      children,
                      maybeComponent
                    ) {
                      var res = 0;
                      for (var i = 0; i < children.length; i++) {
                        var el = children[i];
                        if (el.type !== 1) {
                          continue
                        }
                        if (needsNormalization(el) ||
                            (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
                          res = 2;
                          break
                        }
                        if (maybeComponent(el) ||
                            (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
                          res = 1;
                        }
                      }
                      return res
                    }
                  
                    function needsNormalization (el) {
                      return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
                    }
                  
                    function genNode (node, state) {
                      if (node.type === 1) {
                        return genElement(node, state)
                      } else if (node.type === 3 && node.isComment) {
                        return genComment(node)
                      } else {
                        return genText(node)
                      }
                    }
                  
                    function genText (text) {
                      return ("_v(" + (text.type === 2
                        ? text.expression // no need for () because already wrapped in _s()
                        : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
                    }
                  
                    function genComment (comment) {
                      return ("_e(" + (JSON.stringify(comment.text)) + ")")
                    }
                  
                    function genSlot (el, state) {
                      var slotName = el.slotName || '"default"';
                      var children = genChildren(el, state);
                      var res = "_t(" + slotName + (children ? ("," + children) : '');
                      var attrs = el.attrs || el.dynamicAttrs
                        ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
                            // slot props are camelized
                            name: camelize(attr.name),
                            value: attr.value,
                            dynamic: attr.dynamic
                          }); }))
                        : null;
                      var bind$$1 = el.attrsMap['v-bind'];
                      if ((attrs || bind$$1) && !children) {
                        res += ",null";
                      }
                      if (attrs) {
                        res += "," + attrs;
                      }
                      if (bind$$1) {
                        res += (attrs ? '' : ',null') + "," + bind$$1;
                      }
                      return res + ')'
                    }
                  
                    // componentName is el.component, take it as argument to shun flow's pessimistic refinement
                    function genComponent (
                      componentName,
                      el,
                      state
                    ) {
                      var children = el.inlineTemplate ? null : genChildren(el, state, true);
                      return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
                    }
                  
                    function genProps (props) {
                      var staticProps = "";
                      var dynamicProps = "";
                      for (var i = 0; i < props.length; i++) {
                        var prop = props[i];
                        var value = transformSpecialNewlines(prop.value);
                        if (prop.dynamic) {
                          dynamicProps += (prop.name) + "," + value + ",";
                        } else {
                          staticProps += "\"" + (prop.name) + "\":" + value + ",";
                        }
                      }
                      staticProps = "{" + (staticProps.slice(0, -1)) + "}";
                      if (dynamicProps) {
                        return ("_d(" + staticProps + ",[" + (dynamicProps.slice(0, -1)) + "])")
                      } else {
                        return staticProps
                      }
                    }
                  
                    // #3895, #4268
                    function transformSpecialNewlines (text) {
                      return text
                        .replace(/\u2028/g, '\\u2028')
                        .replace(/\u2029/g, '\\u2029')
                    }
                  
                    /*  */
                  
                  
                  
                    // these keywords should not appear inside expressions, but operators like
                    // typeof, instanceof and in are allowed
                    var prohibitedKeywordRE = new RegExp('\\b' + (
                      'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
                      'super,throw,while,yield,delete,export,import,return,switch,default,' +
                      'extends,finally,continue,debugger,function,arguments'
                    ).split(',').join('\\b|\\b') + '\\b');
                  
                    // these unary operators should not be used as property/method names
                    var unaryOperatorsRE = new RegExp('\\b' + (
                      'delete,typeof,void'
                    ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');
                  
                    // strip strings in expressions
                    var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
                  
                    // detect problematic expressions in a template
                    function detectErrors (ast, warn) {
                      if (ast) {
                        checkNode(ast, warn);
                      }
                    }
                  
                    function checkNode (node, warn) {
                      if (node.type === 1) {
                        for (var name in node.attrsMap) {
                          if (dirRE.test(name)) {
                            var value = node.attrsMap[name];
                            if (value) {
                              var range = node.rawAttrsMap[name];
                              if (name === 'v-for') {
                                checkFor(node, ("v-for=\"" + value + "\""), warn, range);
                              } else if (name === 'v-slot' || name[0] === '#') {
                                checkFunctionParameterExpression(value, (name + "=\"" + value + "\""), warn, range);
                              } else if (onRE.test(name)) {
                                checkEvent(value, (name + "=\"" + value + "\""), warn, range);
                              } else {
                                checkExpression(value, (name + "=\"" + value + "\""), warn, range);
                              }
                            }
                          }
                        }
                        if (node.children) {
                          for (var i = 0; i < node.children.length; i++) {
                            checkNode(node.children[i], warn);
                          }
                        }
                      } else if (node.type === 2) {
                        checkExpression(node.expression, node.text, warn, node);
                      }
                    }
                  
                    function checkEvent (exp, text, warn, range) {
                      var stripped = exp.replace(stripStringRE, '');
                      var keywordMatch = stripped.match(unaryOperatorsRE);
                      if (keywordMatch && stripped.charAt(keywordMatch.index - 1) !== '$') {
                        warn(
                          "avoid using JavaScript unary operator as property name: " +
                          "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim()),
                          range
                        );
                      }
                      checkExpression(exp, text, warn, range);
                    }
                  
                    function checkFor (node, text, warn, range) {
                      checkExpression(node.for || '', text, warn, range);
                      checkIdentifier(node.alias, 'v-for alias', text, warn, range);
                      checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range);
                      checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range);
                    }
                  
                    function checkIdentifier (
                      ident,
                      type,
                      text,
                      warn,
                      range
                    ) {
                      if (typeof ident === 'string') {
                        try {
                          new Function(("var " + ident + "=_"));
                        } catch (e) {
                          warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
                        }
                      }
                    }
                  
                    function checkExpression (exp, text, warn, range) {
                      try {
                        new Function(("return " + exp));
                      } catch (e) {
                        var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
                        if (keywordMatch) {
                          warn(
                            "avoid using JavaScript keyword as property name: " +
                            "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim()),
                            range
                          );
                        } else {
                          warn(
                            "invalid expression: " + (e.message) + " in\n\n" +
                            "    " + exp + "\n\n" +
                            "  Raw expression: " + (text.trim()) + "\n",
                            range
                          );
                        }
                      }
                    }
                  
                    function checkFunctionParameterExpression (exp, text, warn, range) {
                      try {
                        new Function(exp, '');
                      } catch (e) {
                        warn(
                          "invalid function parameter expression: " + (e.message) + " in\n\n" +
                          "    " + exp + "\n\n" +
                          "  Raw expression: " + (text.trim()) + "\n",
                          range
                        );
                      }
                    }
                  
                    /*  */
                  
                    var range = 2;
                  
                    function generateCodeFrame (
                      source,
                      start,
                      end
                    ) {
                      if ( start === void 0 ) start = 0;
                      if ( end === void 0 ) end = source.length;
                  
                      var lines = source.split(/\r?\n/);
                      var count = 0;
                      var res = [];
                      for (var i = 0; i < lines.length; i++) {
                        count += lines[i].length + 1;
                        if (count >= start) {
                          for (var j = i - range; j <= i + range || end > count; j++) {
                            if (j < 0 || j >= lines.length) { continue }
                            res.push(("" + (j + 1) + (repeat$1(" ", 3 - String(j + 1).length)) + "|  " + (lines[j])));
                            var lineLength = lines[j].length;
                            if (j === i) {
                              // push underline
                              var pad = start - (count - lineLength) + 1;
                              var length = end > count ? lineLength - pad : end - start;
                              res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
                            } else if (j > i) {
                              if (end > count) {
                                var length$1 = Math.min(end - count, lineLength);
                                res.push("   |  " + repeat$1("^", length$1));
                              }
                              count += lineLength + 1;
                            }
                          }
                          break
                        }
                      }
                      return res.join('\n')
                    }
                  
                    function repeat$1 (str, n) {
                      var result = '';
                      if (n > 0) {
                        while (true) { // eslint-disable-line
                          if (n & 1) { result += str; }
                          n >>>= 1;
                          if (n <= 0) { break }
                          str += str;
                        }
                      }
                      return result
                    }
                  
                    /*  */
                  
                  
                  
                    function createFunction (code, errors) {
                      try {
                        return new Function(code)
                      } catch (err) {
                        errors.push({ err: err, code: code });
                        return noop
                      }
                    }
                  
                    function createCompileToFunctionFn (compile) {
                      var cache = Object.create(null);
                  
                      return function compileToFunctions (
                        template,
                        options,
                        vm
                      ) {
                        options = extend({}, options);
                        var warn$$1 = options.warn || warn;
                        delete options.warn;
                  
                        /* istanbul ignore if */
                        {
                          // detect possible CSP restriction
                          try {
                            new Function('return 1');
                          } catch (e) {
                            if (e.toString().match(/unsafe-eval|CSP/)) {
                              warn$$1(
                                'It seems you are using the standalone build of Vue.js in an ' +
                                'environment with Content Security Policy that prohibits unsafe-eval. ' +
                                'The template compiler cannot work in this environment. Consider ' +
                                'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                                'templates into render functions.'
                              );
                            }
                          }
                        }
                  
                        // check cache
                        var key = options.delimiters
                          ? String(options.delimiters) + template
                          : template;
                        if (cache[key]) {
                          return cache[key]
                        }
                  
                        // compile
                        var compiled = compile(template, options);
                  
                        // check compilation errors/tips
                        {
                          if (compiled.errors && compiled.errors.length) {
                            if (options.outputSourceRange) {
                              compiled.errors.forEach(function (e) {
                                warn$$1(
                                  "Error compiling template:\n\n" + (e.msg) + "\n\n" +
                                  generateCodeFrame(template, e.start, e.end),
                                  vm
                                );
                              });
                            } else {
                              warn$$1(
                                "Error compiling template:\n\n" + template + "\n\n" +
                                compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
                                vm
                              );
                            }
                          }
                          if (compiled.tips && compiled.tips.length) {
                            if (options.outputSourceRange) {
                              compiled.tips.forEach(function (e) { return tip(e.msg, vm); });
                            } else {
                              compiled.tips.forEach(function (msg) { return tip(msg, vm); });
                            }
                          }
                        }
                  
                        // turn code into functions
                        var res = {};
                        var fnGenErrors = [];
                        res.render = createFunction(compiled.render, fnGenErrors);
                        res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
                          return createFunction(code, fnGenErrors)
                        });
                  
                        // check function generation errors.
                        // this should only happen if there is a bug in the compiler itself.
                        // mostly for codegen development use
                        /* istanbul ignore if */
                        {
                          if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                            warn$$1(
                              "Failed to generate render function:\n\n" +
                              fnGenErrors.map(function (ref) {
                                var err = ref.err;
                                var code = ref.code;
                  
                                return ((err.toString()) + " in\n\n" + code + "\n");
                            }).join('\n'),
                              vm
                            );
                          }
                        }
                  
                        return (cache[key] = res)
                      }
                    }
                  
                    /*  */
                  
                    function createCompilerCreator (baseCompile) {
                      return function createCompiler (baseOptions) {
                        function compile (
                          template,
                          options
                        ) {
                          var finalOptions = Object.create(baseOptions);
                          var errors = [];
                          var tips = [];
                  
                          var warn = function (msg, range, tip) {
                            (tip ? tips : errors).push(msg);
                          };
                  
                          if (options) {
                            if (options.outputSourceRange) {
                              // $flow-disable-line
                              var leadingSpaceLength = template.match(/^\s*/)[0].length;
                  
                              warn = function (msg, range, tip) {
                                var data = { msg: msg };
                                if (range) {
                                  if (range.start != null) {
                                    data.start = range.start + leadingSpaceLength;
                                  }
                                  if (range.end != null) {
                                    data.end = range.end + leadingSpaceLength;
                                  }
                                }
                                (tip ? tips : errors).push(data);
                              };
                            }
                            // merge custom modules
                            if (options.modules) {
                              finalOptions.modules =
                                (baseOptions.modules || []).concat(options.modules);
                            }
                            // merge custom directives
                            if (options.directives) {
                              finalOptions.directives = extend(
                                Object.create(baseOptions.directives || null),
                                options.directives
                              );
                            }
                            // copy other options
                            for (var key in options) {
                              if (key !== 'modules' && key !== 'directives') {
                                finalOptions[key] = options[key];
                              }
                            }
                          }
                  
                          finalOptions.warn = warn;
                  
                          var compiled = baseCompile(template.trim(), finalOptions);
                          {
                            detectErrors(compiled.ast, warn);
                          }
                          compiled.errors = errors;
                          compiled.tips = tips;
                          return compiled
                        }
                  
                        return {
                          compile: compile,
                          compileToFunctions: createCompileToFunctionFn(compile)
                        }
                      }
                    }
                  
                    /*  */
                  
                    // `createCompilerCreator` allows creating compilers that use alternative
                    // parser/optimizer/codegen, e.g the SSR optimizing compiler.
                    // Here we just export a default compiler using the default parts.
                    var createCompiler = createCompilerCreator(function baseCompile (
                      template,
                      options
                    ) {
                      var ast = parse(template.trim(), options);
                      if (options.optimize !== false) {
                        optimize(ast, options);
                      }
                      var code = generate(ast, options);
                      return {
                        ast: ast,
                        render: code.render,
                        staticRenderFns: code.staticRenderFns
                      }
                    });
                  
                    /*  */
                  
                    var ref$1 = createCompiler(baseOptions);
                    var compile = ref$1.compile;
                    var compileToFunctions = ref$1.compileToFunctions;
                  
                    /*  */
                  
                    // check whether current browser encodes a char inside attribute values
                    var div;
                    function getShouldDecode (href) {
                      div = div || document.createElement('div');
                      div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
                      return div.innerHTML.indexOf('&#10;') > 0
                    }
                  
                    // #3663: IE encodes newlines inside attribute values while other browsers don't
                    var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
                    // #6828: chrome encodes content in a[href]
                    var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;
                  
                    /*  */
                  
                    var idToTemplate = cached(function (id) {
                      var el = query(id);
                      return el && el.innerHTML
                    });
                  
                    var mount = Vue.prototype.$mount;
                    Vue.prototype.$mount = function (
                      el,
                      hydrating
                    ) {
                      el = el && query(el);
                  
                      /* istanbul ignore if */
                      if (el === document.body || el === document.documentElement) {
                        warn(
                          "Do not mount Vue to <html> or <body> - mount to normal elements instead."
                        );
                        return this
                      }
                  
                      var options = this.$options;
                      // resolve template/el and convert to render function
                      if (!options.render) {
                        var template = options.template;
                        if (template) {
                          if (typeof template === 'string') {
                            if (template.charAt(0) === '#') {
                              template = idToTemplate(template);
                              /* istanbul ignore if */
                              if (!template) {
                                warn(
                                  ("Template element not found or is empty: " + (options.template)),
                                  this
                                );
                              }
                            }
                          } else if (template.nodeType) {
                            template = template.innerHTML;
                          } else {
                            {
                              warn('invalid template option:' + template, this);
                            }
                            return this
                          }
                        } else if (el) {
                          template = getOuterHTML(el);
                        }
                        if (template) {
                          /* istanbul ignore if */
                          if (config.performance && mark) {
                            mark('compile');
                          }
                  
                          var ref = compileToFunctions(template, {
                            outputSourceRange: "development" !== 'production',
                            shouldDecodeNewlines: shouldDecodeNewlines,
                            shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
                            delimiters: options.delimiters,
                            comments: options.comments
                          }, this);
                          var render = ref.render;
                          var staticRenderFns = ref.staticRenderFns;
                          options.render = render;
                          options.staticRenderFns = staticRenderFns;
                  
                          /* istanbul ignore if */
                          if (config.performance && mark) {
                            mark('compile end');
                            measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
                          }
                        }
                      }
                      return mount.call(this, el, hydrating)
                    };
                  
                    /**
                     * Get outerHTML of elements, taking care
                     * of SVG elements in IE as well.
                     */
                    function getOuterHTML (el) {
                      if (el.outerHTML) {
                        return el.outerHTML
                      } else {
                        var container = document.createElement('div');
                        container.appendChild(el.cloneNode(true));
                        return container.innerHTML
                      }
                    }
                  
                    Vue.compile = compileToFunctions;
                  
                    return Vue;
                  
                  }));